# Properties

public class **Properties** extends [Hashtable](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html), [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\>  

|---|---|---|
| Known Direct Subclasses [Provider](https://developers.google.com/j2objc/javadoc/jre/reference/java/security/Provider.html) |---|---| | [Provider](https://developers.google.com/j2objc/javadoc/jre/reference/java/security/Provider.html) | This class represents a "provider" for the Java Security API, where a provider implements some or all parts of Java Security. | |||

The `Properties` class represents a persistent set of
properties. The `Properties` can be saved to a stream
or loaded from a stream. Each key and its corresponding value in
the property list is a string.


A property list can contain another property list as its
"defaults"; this second property list is searched if
the property key is not found in the original property list.


Because `Properties` inherits from `Hashtable`, the
`put` and `putAll` methods can be applied to a
`Properties` object. Their use is strongly discouraged as they
allow the caller to insert entries whose keys or values are not
`Strings`. The `setProperty` method should be used
instead. If the `store` or `save` method is called
on a "compromised" `Properties` object that contains a
non-`String` key or value, the call will fail. Similarly,
the call to the `propertyNames` or `list` method
will fail if it is called on a "compromised" `Properties`
object that contains a non-`String` key.


The `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.Reader)` /
`https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#store(java.io.Writer,%20java.lang.String)`
methods load and store properties from and to a character based stream
in a simple line-oriented format specified below.

The `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.InputStream)` /
`https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#store(java.io.OutputStream,%20java.lang.String)`
methods work the same way as the load(Reader)/store(Writer, String) pair, except
the input/output stream is encoded in ISO 8859-1 character encoding.
Characters that cannot be directly represented in this encoding can be written using
Unicode escapes as defined in section 3.3 of
The Java™ Language Specification;
only a single 'u' character is allowed in an escape
sequence. The native2ascii tool can be used to convert property files to and
from other character encodings.

The `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#loadFromXML(java.io.InputStream)` and `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#storeToXML(java.io.OutputStream,%20java.lang.String,%20java.lang.String)` methods load and store properties
in a simple XML format. By default the UTF-8 character encoding is used,
however a specific encoding may be specified if required. Implementations
are required to support UTF-8 and UTF-16 and may support other encodings.
An XML properties document has the following DOCTYPE declaration:

```
 <!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
 
```
Note that the system URI (http://java.sun.com/dtd/properties.dtd) is *not* accessed when exporting or importing properties; it merely serves as a string to uniquely identify the DTD, which is:

```
    <?xml version="1.0" encoding="UTF-8"?>

    <!-- DTD for properties -->

    <!ELEMENT properties ( comment?, entry* ) >

    <!ATTLIST properties version CDATA #FIXED "1.0">

    <!ELEMENT comment (#PCDATA) >

    <!ELEMENT entry (#PCDATA) >

    <!ATTLIST entry key CDATA #REQUIRED>
 
```

This class is thread-safe: multiple threads can share a single
Properties object without the need for external synchronization.

### Nested Class Summary

|---|---|---|---|
| class | [Properties.LineReader](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.LineReader.html) || Read in a "logical line" from an InputStream/Reader, skip all comment and blank lines and filter out those leading whitespace characters ( , and ) from the beginning of a "natural line". |
| interface | [Properties.XmlLoader](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.XmlLoader.html) || Creates a dynamic dependency on XML support so that XML support can be excluded from the application binary without incurring link errors. |

### Field Summary

|---|---|---|
| protected [Properties](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html) | [defaults](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#defaults) | A property list that contains default values for any keys not found in this property list. |

### Public Constructor Summary

|---|---|
|   | [Properties](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#Properties())() Creates an empty property list with no default values. |
|   | [Properties](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#Properties(java.util.Properties))([Properties](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html) defaults) Creates an empty property list with the specified defaults. |

### Public Method Summary

|---|---|
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#getProperty(java.lang.String,%20java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) defaultValue) Searches for the property with the specified key in this property list. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#getProperty(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key) Searches for the property with the specified key in this property list. |
| void | [list](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#list(java.io.PrintStream))([PrintStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/PrintStream.html) out) Prints this property list out to the specified output stream. |
| void | [list](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#list(java.io.PrintWriter))([PrintWriter](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/PrintWriter.html) out) Prints this property list out to the specified output stream. |
| synchronized void | [load](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.InputStream))([InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) inStream) Reads a property list (key and element pairs) from the input byte stream. |
| synchronized void | [load](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.Reader))([Reader](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/Reader.html) reader) Reads a property list (key and element pairs) from the input character stream in a simple line-oriented format. |
| synchronized void | [loadFromXML](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#loadFromXML(java.io.InputStream))([InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) in) Loads all of the properties represented by the XML document on the specified input stream into this properties table. |
| [Enumeration](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Enumeration.html)\<?\> | [propertyNames](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#propertyNames())() Returns an enumeration of all the keys in this property list, including distinct keys in the default property list if a key of the same name has not already been found from the main properties list. |
| void | [save](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#save(java.io.OutputStream,%20java.lang.String))([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) out, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comments) *This method is deprecated. This method does not throw an IOException if an I/O error occurs while saving the property list. The preferred way to save a properties list is via the `store(OutputStream out, String comments)` method or the `storeToXML(OutputStream os, String comment)` method.* |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [setProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#setProperty(java.lang.String,%20java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value) Calls the Hashtable method `put`. |
| void | [store](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#store(java.io.OutputStream,%20java.lang.String))([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) out, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comments) Writes this property list (key and element pairs) in this `Properties` table to the output stream in a format suitable for loading into a `Properties` table using the `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.InputStream)` method. |
| void | [store](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#store(java.io.Writer,%20java.lang.String))([Writer](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/Writer.html) writer, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comments) Writes this property list (key and element pairs) in this `Properties` table to the output character stream in a format suitable for using the `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.Reader)` method. |
| void | [storeToXML](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#storeToXML(java.io.OutputStream,%20java.lang.String,%20java.lang.String))([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) os, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comment, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) encoding) Emits an XML document representing all of the properties contained in this table, using the specified encoding. |
| void | [storeToXML](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#storeToXML(java.io.OutputStream,%20java.lang.String))([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) os, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comment) Emits an XML document representing all of the properties contained in this table. |
| [Set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\> | [stringPropertyNames](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#stringPropertyNames())() Returns a set of keys in this property list where the key and its corresponding value are strings, including distinct keys in the default property list if a key of the same name has not already been found from the main properties list. |

### Inherited Method Summary

From class [java.util.Hashtable](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html)

|---|---|
| synchronized void | [clear](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#clear())() Clears this hashtable so that it contains no keys. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [clone](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#clone())() Creates a shallow copy of this hashtable. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [compute](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#compute(K,%20java.util.function.BiFunction<?%20super%20K,%20?%20super%20V,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super K, ? super V, ? extends V\> remappingFunction) Attempts to compute a mapping for the specified key and its current mapped value (or `null` if there is no current mapping). |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [computeIfAbsent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#computeIfAbsent(K,%20java.util.function.Function<?%20super%20K,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Function](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/Function.html)\<? super K, ? extends V\> mappingFunction) If the specified key is not already associated with a value (or is mapped to `null`), attempts to compute its value using the given mapping function and enters it into this map unless `null`. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [computeIfPresent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#computeIfPresent(K,%20java.util.function.BiFunction<?%20super%20K,%20?%20super%20V,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super K, ? super V, ? extends V\> remappingFunction) If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value. |
| synchronized boolean | [contains](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#contains(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Tests if some key maps into the specified value in this hashtable. |
| synchronized boolean | [containsKey](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#containsKey(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Tests if the specified object is a key in this hashtable. |
| boolean | [containsValue](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#containsValue(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Returns true if this hashtable maps one or more keys to this value. |
| synchronized [Enumeration](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Enumeration.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [elements](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#elements())() Returns an enumeration of the values in this hashtable. |
| [Set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html)\<[Entry](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.Entry.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html), [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\>\> | [entrySet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#entrySet())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html` view of the mappings contained in this map. |
| synchronized boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) o) Compares the specified Object with this Map for equality, as per the definition in the Map interface. |
| synchronized void | [forEach](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#forEach(java.util.function.BiConsumer<?%20super%20K,%20?%20super%20V>))([BiConsumer](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiConsumer.html)\<? super K, ? super V\> action) Performs the given action for each entry in this map until all entries have been processed or the action throws an exception. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [get](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#get(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Returns the value to which the specified key is mapped, or `null` if this map contains no mapping for the key. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [getOrDefault](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#getOrDefault(java.lang.Object,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) defaultValue) Returns the value to which the specified key is mapped, or `defaultValue` if this map contains no mapping for the key. |
| synchronized int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#hashCode())() Returns the hash code value for this Map as per the definition in the Map interface. |
| synchronized boolean | [isEmpty](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#isEmpty())() Tests if this hashtable maps no keys to values. |
| [Set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [keySet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#keySet())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html` view of the keys contained in this map. |
| synchronized [Enumeration](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Enumeration.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [keys](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#keys())() Returns an enumeration of the keys in this hashtable. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [merge](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#merge(K,%20V,%20java.util.function.BiFunction<?%20super%20V,%20?%20super%20V,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value, [BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super V, ? super V, ? extends V\> remappingFunction) If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [put](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#put(K,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Maps the specified `key` to the specified `value` in this hashtable. |
| synchronized void | [putAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#putAll(java.util.Map<?%20extends%20K,%20?%20extends%20V>))([Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<? extends K, ? extends V\> t) Copies all of the mappings from the specified map to this hashtable. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [putIfAbsent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#putIfAbsent(K,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) If the specified key is not already associated with a value (or is mapped to `null`) associates it with the given value and returns `null`, else returns the current value. |
| void | [rehash](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#rehash())() Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently. |
| synchronized boolean | [remove](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#remove(java.lang.Object,%20java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Removes the entry for the specified key only if it is currently mapped to the specified value. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [remove](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#remove(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Removes the key (and its corresponding value) from this hashtable. |
| synchronized boolean | [replace](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#replace(K,%20V,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) oldValue, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) newValue) Replaces the entry for the specified key only if currently mapped to the specified value. |
| synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [replace](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#replace(K,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Replaces the entry for the specified key only if it is currently mapped to some value. |
| synchronized void | [replaceAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#replaceAll(java.util.function.BiFunction<?%20super%20K,%20?%20super%20V,%20?%20extends%20V>))([BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super K, ? super V, ? extends V\> function) Replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception. |
| synchronized int | [size](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#size())() Returns the number of keys in this hashtable. |
| synchronized [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#toString())() Returns a string representation of this Hashtable object in the form of a set of entries, enclosed in braces and separated by the ASCII characters ", " (comma and space). |
| [Collection](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [values](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Hashtable.html#values())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html` view of the values contained in this map. |

From class [java.util.Dictionary](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html)

|---|---|
| abstract [Enumeration](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Enumeration.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [elements](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html#elements())() Returns an enumeration of the values in this dictionary. |
| abstract [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [get](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html#get(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Returns the value to which the key is mapped in this dictionary. |
| abstract boolean | [isEmpty](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html#isEmpty())() Tests if this dictionary maps no keys to value. |
| abstract [Enumeration](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Enumeration.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [keys](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html#keys())() Returns an enumeration of the keys in this dictionary. |
| abstract [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [put](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html#put(K,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Maps the specified `key` to the specified `value` in this dictionary. |
| abstract [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [remove](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html#remove(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Removes the `key` (and its corresponding `value`) from this dictionary. |
| abstract int | [size](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Dictionary.html#size())() Returns the number of entries (distinct keys) in this dictionary. |

From class [java.lang.Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)

|---|---|
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [clone](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#clone())() Creates and returns a copy of this `Object`. |
| boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj) Compares this instance with the specified object and indicates if they are equal. |
| void | [finalize](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#finalize())() Invoked when the garbage collector has detected that this instance is no longer reachable. |
| final [Class](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html)\<?\> | [getClass](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#getClass())() Returns the unique instance of `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html` that represents this object's class. |
| int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#hashCode())() Returns an integer hash code for this object. |
| final void | [notify](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notify())() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| final void | [notifyAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notifyAll())() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#toString())() Returns a string containing a concise, human-readable description of this object. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long,%20int))(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long))(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait())() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object. |

From interface [java.util.Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)

|---|---|
| abstract void | [clear](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#clear())() Removes all of the mappings from this map (optional operation). |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [compute](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#compute(K,%20java.util.function.BiFunction<?%20super%20K,%20?%20super%20V,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super K, ? super V, ? extends V\> remappingFunction) Attempts to compute a mapping for the specified key and its current mapped value (or `null` if there is no current mapping). |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [computeIfAbsent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#computeIfAbsent(K,%20java.util.function.Function<?%20super%20K,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Function](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/Function.html)\<? super K, ? extends V\> mappingFunction) If the specified key is not already associated with a value (or is mapped to `null`), attempts to compute its value using the given mapping function and enters it into this map unless `null`. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [computeIfPresent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#computeIfPresent(K,%20java.util.function.BiFunction<?%20super%20K,%20?%20super%20V,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super K, ? super V, ? extends V\> remappingFunction) If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value. |
| abstract boolean | [containsKey](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#containsKey(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Returns `true` if this map contains a mapping for the specified key. |
| abstract boolean | [containsValue](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#containsValue(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Returns `true` if this map maps one or more keys to the specified value. |
| abstract [Set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html)\<[Entry](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.Entry.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html), [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\>\> | [entrySet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#entrySet())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html` view of the mappings contained in this map. |
| abstract boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) o) Compares the specified object with this map for equality. |
| void | [forEach](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#forEach(java.util.function.BiConsumer<?%20super%20K,%20?%20super%20V>))([BiConsumer](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiConsumer.html)\<? super K, ? super V\> action) Performs the given action for each entry in this map until all entries have been processed or the action throws an exception. |
| abstract [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [get](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#get(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Returns the value to which the specified key is mapped, or `null` if this map contains no mapping for the key. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [getOrDefault](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#getOrDefault(java.lang.Object,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) defaultValue) Returns the value to which the specified key is mapped, or `defaultValue` if this map contains no mapping for the key. |
| abstract int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#hashCode())() Returns the hash code value for this map. |
| abstract boolean | [isEmpty](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#isEmpty())() Returns `true` if this map contains no key-value mappings. |
| abstract [Set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [keySet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#keySet())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html` view of the keys contained in this map. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [merge](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#merge(K,%20V,%20java.util.function.BiFunction<?%20super%20V,%20?%20super%20V,%20?%20extends%20V>))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value, [BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super V, ? super V, ? extends V\> remappingFunction) If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value. |
| abstract [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [put](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#put(K,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Associates the specified value with the specified key in this map (optional operation). |
| abstract void | [putAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#putAll(java.util.Map<?%20extends%20K,%20?%20extends%20V>))([Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<? extends K, ? extends V\> m) Copies all of the mappings from the specified map to this map (optional operation). |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [putIfAbsent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#putIfAbsent(K,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) If the specified key is not already associated with a value (or is mapped to `null`) associates it with the given value and returns `null`, else returns the current value. |
| boolean | [remove](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#remove(java.lang.Object,%20java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Removes the entry for the specified key only if it is currently mapped to the specified value. |
| abstract [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [remove](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#remove(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key) Removes the mapping for a key from this map if it is present (optional operation). |
| boolean | [replace](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#replace(K,%20V,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) oldValue, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) newValue) Replaces the entry for the specified key only if currently mapped to the specified value. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [replace](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#replace(K,%20V))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) key, [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) value) Replaces the entry for the specified key only if it is currently mapped to some value. |
| void | [replaceAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#replaceAll(java.util.function.BiFunction<?%20super%20K,%20?%20super%20V,%20?%20extends%20V>))([BiFunction](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/function/BiFunction.html)\<? super K, ? super V, ? extends V\> function) Replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception. |
| abstract int | [size](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#size())() Returns the number of key-value mappings in this map. |
| abstract [Collection](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html)\<[Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)\> | [values](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#values())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html` view of the values contained in this map. |

## Fields

#### protected Properties
**defaults**

A property list that contains default values for any keys not
found in this property list.

## Public Constructors

#### public
**Properties**
()

Creates an empty property list with no default values.

#### public
**Properties**
([Properties](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html) defaults)

Creates an empty property list with the specified defaults.

##### Parameters

| defaults | the defaults. |
|---|---|

## Public Methods

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) defaultValue)

Searches for the property with the specified key in this property list.
If the key is not found in this property list, the default property list,
and its defaults, recursively, are then checked. The method returns the
default value argument if the property is not found.

##### Parameters

| key | the hashtable key. |
| defaultValue | a default value. |
|---|---|

##### Returns

- the value in this property list with the specified key value.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#setProperty(java.lang.String,%20java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#defaults`

#### public [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)
**getProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key)

Searches for the property with the specified key in this property list.
If the key is not found in this property list, the default property list,
and its defaults, recursively, are then checked. The method returns
`null` if the property is not found.

##### Parameters

| key | the property key. |
|---|---|

##### Returns

- the value in this property list with the specified key value.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#setProperty(java.lang.String,%20java.lang.String)`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#defaults`

#### public void
**list**
([PrintStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/PrintStream.html) out)

Prints this property list out to the specified output stream.
This method is useful for debugging.

##### Parameters

| out | an output stream. |
|---|---|

##### Throws

| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if any key in this property list is not a string. |
|---|---|

#### public void
**list**
([PrintWriter](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/PrintWriter.html) out)

Prints this property list out to the specified output stream.
This method is useful for debugging.

##### Parameters

| out | an output stream. |
|---|---|

##### Throws

| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if any key in this property list is not a string. |
|---|---|

#### public synchronized void
**load**
([InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) inStream)

Reads a property list (key and element pairs) from the input
byte stream. The input stream is in a simple line-oriented
format as specified in
`https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.Reader)` and is assumed to use
the ISO 8859-1 character encoding; that is each byte is one Latin1
character. Characters not in Latin1, and certain special characters,
are represented in keys and elements using Unicode escapes as defined in
section 3.3 of
The Java™ Language Specification.


The specified stream remains open after this method returns.

##### Parameters

| inStream | the input stream. |
|---|---|

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an error occurred when reading from the input stream. |
| [IllegalArgumentException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalArgumentException.html) | if the input stream contains a malformed Unicode escape sequence. |
|---|---|

#### public synchronized void
**load**
([Reader](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/Reader.html) reader)

Reads a property list (key and element pairs) from the input
character stream in a simple line-oriented format.


Properties are processed in terms of lines. There are two
kinds of line, *natural lines* and *logical lines*.
A natural line is defined as a line of
characters that is terminated either by a set of line terminator
characters (`\n` or `\r` or `\r\n`)
or by the end of the stream. A natural line may be either a blank line,
a comment line, or hold all or some of a key-element pair. A logical
line holds all the data of a key-element pair, which may be spread
out across several adjacent natural lines by escaping
the line terminator sequence with a backslash character
`\`. Note that a comment line cannot be extended
in this manner; every natural line that is a comment must have
its own comment indicator, as described below. Lines are read from
input until the end of the stream is reached.


A natural line that contains only white space characters is
considered blank and is ignored. A comment line has an ASCII
`'#'` or `'!'` as its first non-white
space character; comment lines are also ignored and do not
encode key-element information. In addition to line
terminators, this format considers the characters space
(`' '`, `'\u0020'`), tab
(`'\t'`, `'\u0009'`), and form feed
(`'\f'`, `'\u000C'`) to be white
space.


If a logical line is spread across several natural lines, the
backslash escaping the line terminator sequence, the line
terminator sequence, and any white space at the start of the
following line have no affect on the key or element values.
The remainder of the discussion of key and element parsing
(when loading) will assume all the characters constituting
the key and element appear on a single natural line after
line continuation characters have been removed. Note that
it is *not* sufficient to only examine the character
preceding a line terminator sequence to decide if the line
terminator is escaped; there must be an odd number of
contiguous backslashes for the line terminator to be escaped.
Since the input is processed from left to right, a
non-zero even number of 2*n* contiguous backslashes
before a line terminator (or elsewhere) encodes *n*
backslashes after escape processing.


The key contains all of the characters in the line starting
with the first non-white space character and up to, but not
including, the first unescaped `'='`,
`':'`, or white space character other than a line
terminator. All of these key termination characters may be
included in the key by escaping them with a preceding backslash
character; for example,


`\:\=`


would be the two-character key `":="`. Line
terminator characters can be included using `\r` and
`\n` escape sequences. Any white space after the
key is skipped; if the first non-white space character after
the key is `'='` or `':'`, then it is
ignored and any white space characters after it are also
skipped. All remaining characters on the line become part of
the associated element string; if there are no remaining
characters, the element is the empty string
`""`. Once the raw character sequences
constituting the key and element are identified, escape
processing is performed as described above.


As an example, each of the following three lines specifies the key
`"Truth"` and the associated element value
`"Beauty"`:

```
 Truth = Beauty
  Truth:Beauty
 Truth                    :Beauty
 
```
As another example, the following three lines specify a single property:

```
 fruits                           apple, banana, pear, \
                                  cantaloupe, watermelon, \
                                  kiwi, mango
 
```
The key is `"fruits"` and the associated element is:

```
"apple, banana, pear, cantaloupe, watermelon, kiwi, mango"
```
Note that a space appears before each `\` so that a space will appear after each comma in the final result; the `\`, line terminator, and leading white space on the continuation line are merely discarded and are *not* replaced by one or more other characters.


As a third example, the line:

```
cheeses
 
```
specifies that the key is `"cheeses"` and the associated element is the empty string `""`.


Characters in keys and elements can be represented in escape
sequences similar to those used for character and string literals
(see sections 3.3 and 3.10.6 of
The Java™ Language Specification).

The differences from the character escape sequences and Unicode
escapes used for characters and strings are:

- Octal escapes are not recognized.
- The character sequence `\b` does *not* represent a backspace character.
- The method does not treat a backslash character, `\`, before a non-valid escape character as an error; the backslash is silently dropped. For example, in a Java string the sequence `"\z"` would cause a compile time error. In contrast, this method silently drops the backslash. Therefore, this method treats the two character sequence `"\b"` as equivalent to the single character `'b'`.
- Escapes are not necessary for single and double quotes; however, by the rule above, single and double quote characters preceded by a backslash still yield single and double quote characters, respectively.
- Only a single 'u' character is allowed in a Unicode escape sequence.


The specified stream remains open after this method returns.

##### Parameters

| reader | the input character stream. |
|---|---|

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an error occurred when reading from the input stream. |
| [IllegalArgumentException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalArgumentException.html) | if a malformed Unicode escape appears in the input. |
|---|---|

#### public synchronized void
**loadFromXML**
([InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) in)

Loads all of the properties represented by the XML document on the
specified input stream into this properties table.

The XML document must have the following DOCTYPE declaration:

```
 <!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
 
```
Furthermore, the document must satisfy the properties DTD described above.

An implementation is required to read XML documents that use the
"`UTF-8`" or "`UTF-16`" encoding. An implementation may
support additional encodings.

The specified stream is closed after this method returns.

##### Parameters

| in | the input stream from which to read the XML document. |
|---|---|

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if reading from the specified input stream results in an IOException. |
| [UnsupportedEncodingException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/UnsupportedEncodingException.html) | if the document's encoding declaration can be read and it specifies an encoding that is not supported |
| [InvalidPropertiesFormatException](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/InvalidPropertiesFormatException.html) | Data on input stream does not constitute a valid XML document with the mandated document type. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `in` is null. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#storeToXML(java.io.OutputStream,%20java.lang.String,%20java.lang.String)`
- [Character
  Encoding in Entities](http://www.w3.org/TR/REC-xml/#charencoding)

#### public [Enumeration](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Enumeration.html)\<?\>
**propertyNames**
()

Returns an enumeration of all the keys in this property list,
including distinct keys in the default property list if a key
of the same name has not already been found from the main
properties list.

##### Returns

- an enumeration of all the keys in this property list, including the keys in the default property list.

##### Throws

| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if any key in this property list is not a string. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Enumeration.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#defaults`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#stringPropertyNames()`

#### public void
**save**
([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) out, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comments)


**This method is deprecated.**   
This method does not throw an IOException if an I/O error
occurs while saving the property list. The preferred way to save a
properties list is via the `store(OutputStream out,
String comments)` method or the
`storeToXML(OutputStream os, String comment)` method.
Calls the `store(OutputStream out, String comments)` method
and suppresses IOExceptions that were thrown.

##### Parameters

| out | an output stream. |
| comments | a description of the property list. |
|---|---|

##### Throws

| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if this `Properties` object contains any keys or values that are not `Strings`. |
|---|---|

#### public synchronized [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)
**setProperty**
([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) value)

Calls the Hashtable method `put`. Provided for
parallelism with the getProperty method. Enforces use of
strings for property keys and values. The value returned is the
result of the Hashtable call to `put`.

##### Parameters

| key | the key to be placed into this property list. |
| value | the value corresponding to key. |
|---|---|

##### Returns

- the previous value of the specified key in this property list, or `null` if it did not have one.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#getProperty(java.lang.String)`

#### public void
**store**
([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) out, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comments)

Writes this property list (key and element pairs) in this
`Properties` table to the output stream in a format suitable
for loading into a `Properties` table using the
`https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.InputStream)` method.


Properties from the defaults table of this `Properties`
table (if any) are *not* written out by this method.


This method outputs the comments, properties keys and values in
the same format as specified in
`https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#store(java.io.Writer,%20java.lang.String)`,
with the following differences:

- The stream is written using the ISO 8859-1 character encoding.
- Characters not in Latin-1 in the comments are written as `\u`*xxxx* for their appropriate unicode hexadecimal value *xxxx*.
- Characters less than `\u0020` and characters greater than `\u007E` in property keys or values are written as `\u`*xxxx* for the appropriate hexadecimal value *xxxx*.


After the entries have been written, the output stream is flushed.
The output stream remains open after this method returns.

<br />

##### Parameters

| out | an output stream. |
| comments | a description of the property list. |
|---|---|

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if writing this property list to the specified output stream throws an IOException. |
| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if this `Properties` object contains any keys or values that are not `Strings`. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `out` is null. |
|---|---|

#### public void
**store**
([Writer](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/Writer.html) writer, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comments)

Writes this property list (key and element pairs) in this
`Properties` table to the output character stream in a
format suitable for using the `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#load(java.io.Reader)`
method.


Properties from the defaults table of this `Properties`
table (if any) are *not* written out by this method.


If the comments argument is not null, then an ASCII `#`
character, the comments string, and a line separator are first written
to the output stream. Thus, the `comments` can serve as an
identifying comment. Any one of a line feed ('\\n'), a carriage
return ('\\r'), or a carriage return followed immediately by a line feed
in comments is replaced by a line separator generated by the `Writer`
and if the next character in comments is not character `#` or
character `!` then an ASCII `#` is written out
after that line separator.


Next, a comment line is always written, consisting of an ASCII
`#` character, the current date and time (as if produced
by the `toString` method of `Date` for the
current time), and a line separator as generated by the `Writer`.


Then every entry in this `Properties` table is
written out, one per line. For each entry the key string is
written, then an ASCII `=`, then the associated
element string. For the key, all space characters are
written with a preceding `\` character. For the
element, leading space characters, but not embedded or trailing
space characters, are written with a preceding `\`
character. The key and element characters `#`,
`!`, `=`, and `:` are written
with a preceding backslash to ensure that they are properly loaded.


After the entries have been written, the output stream is flushed.
The output stream remains open after this method returns.

<br />

##### Parameters

| writer | an output character stream writer. |
| comments | a description of the property list. |
|---|---|

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if writing this property list to the specified output stream throws an IOException. |
| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if this `Properties` object contains any keys or values that are not `Strings`. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `writer` is null. |
|---|---|

#### public void
**storeToXML**
([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) os, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comment, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) encoding)

Emits an XML document representing all of the properties contained
in this table, using the specified encoding.

The XML document will have the following DOCTYPE declaration:

```
 <!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
 
```

If the specified comment is `null` then no comment
will be stored in the document.

An implementation is required to support writing of XML documents
that use the "`UTF-8`" or "`UTF-16`" encoding. An
implementation may support additional encodings.

The specified stream remains open after this method returns.

##### Parameters

| os | the output stream on which to emit the XML document. |
| comment | a description of the property list, or `null` if no comment is desired. |
| encoding | the name of a supported [character encoding](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/package-summary.html#charenc) |
|---|---|

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if writing to the specified output stream results in an IOException. |
| [UnsupportedEncodingException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/UnsupportedEncodingException.html) | if the encoding is not supported by the implementation. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `os` is `null`, or if `encoding` is `null`. |
| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if this `Properties` object contains any keys or values that are not `Strings`. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#loadFromXML(java.io.InputStream)`
- [Character
  Encoding in Entities](http://www.w3.org/TR/REC-xml/#charencoding)

#### public void
**storeToXML**
([OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) os, [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) comment)

Emits an XML document representing all of the properties contained
in this table.

An invocation of this method of the form props.storeToXML(os, comment) behaves in exactly the same way as the invocation
props.storeToXML(os, comment, "UTF-8");.

##### Parameters

| os | the output stream on which to emit the XML document. |
| comment | a description of the property list, or `null` if no comment is desired. |
|---|---|

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if writing to the specified output stream results in an IOException. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `os` is null. |
| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if this `Properties` object contains any keys or values that are not `Strings`. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#loadFromXML(java.io.InputStream)`

#### public [Set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\>
**stringPropertyNames**
()

Returns a set of keys in this property list where
the key and its corresponding value are strings,
including distinct keys in the default property list if a key
of the same name has not already been found from the main
properties list. Properties whose key or value is not
of type String are omitted.


The returned set is not backed by the Properties object.
Changes to this Properties are not reflected in the set,
or vice versa.

##### Returns

- a set of keys in this property list where the key and its corresponding value are strings, including the keys in the default property list.

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Properties.html#defaults`