# JarURLConnection

public abstract class **JarURLConnection** extends [URLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html)  
A URL Connection to a Java ARchive (JAR) file or an entry in a JAR
file.

The syntax of a JAR URL is:

```
 jar:<url>!/{entry}
 
```

for example:

`jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class`

Jar URLs should be used to refer to a JAR file or entries in
a JAR file. The example above is a JAR URL which refers to a JAR
entry. If the entry name is omitted, the URL refers to the whole
JAR file:

`jar:http://www.foo.com/bar/baz.jar!/`

Users should cast the generic URLConnection to a
JarURLConnection when they know that the URL they created is a JAR
URL, and they need JAR-specific functionality. For example:

```
 URL url = new URL("jar:file:/home/duke/duke.jar!/");
 JarURLConnection jarConnection = (JarURLConnection)url.openConnection();
 Manifest manifest = jarConnection.getManifest();
 
```

JarURLConnection instances can only be used to read from JAR files.
It is not possible to get a `https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html` to modify or write
to the underlying JAR file using this class.

Examples:

A Jar entry
:   `jar:http://www.foo.com/bar/baz.jar!/COM/foo/Quux.class`

A Jar file
:   `jar:http://www.foo.com/bar/baz.jar!/`

A Jar directory
:   `jar:http://www.foo.com/bar/baz.jar!/COM/foo/`

`!/` is referred to as the *separator*.

When constructing a JAR url via `new URL(context, spec)`,
the following rules apply:

- if there is no context URL and the specification passed to the URL constructor doesn't contain a separator, the URL is considered to refer to a JarFile.
- if there is a context URL, the context URL is assumed to refer to a JAR file or a Jar directory.
- if the specification begins with a '/', the Jar directory is ignored, and the spec is considered to be at the root of the Jar file. Examples:

  context: **jar:http://www.foo.com/bar/jar.jar!/** ,
  spec:**baz/entry.txt**

  :   url:**jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt**

  context: **jar:http://www.foo.com/bar/jar.jar!/baz** ,
  spec:**entry.txt**

  :   url:**jar:http://www.foo.com/bar/jar.jar!/baz/entry.txt**

  context: **jar:http://www.foo.com/bar/jar.jar!/baz** ,
  spec:**/entry.txt**

  :   url:**jar:http://www.foo.com/bar/jar.jar!/entry.txt**

<br />

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/JarFile.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/JarInputStream.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/Manifest.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/zip/ZipEntry.html`

### Field Summary

|---|---|---|
| protected [URLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html) | [jarFileURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#jarFileURLConnection) | The connection to the JAR file URL, if the connection has been initiated. |

### Inherited Field Summary

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

|---|---|---|
| protected boolean | [allowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#allowUserInteraction) | If `true`, this `URL` is being examined in a context in which it makes sense to allow user interactions such as popping up an authentication dialog. |
| protected boolean | [connected](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connected) | If `false`, this connection object has not created a communications link to the specified URL. |
| protected boolean | [doInput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#doInput) | This variable is set by the `setDoInput` method. |
| protected boolean | [doOutput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#doOutput) | This variable is set by the `setDoOutput` method. |
| protected long | [ifModifiedSince](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#ifModifiedSince) | Some protocols support skipping the fetching of the object unless the object has been modified more recently than a certain time. |
| protected [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) | [url](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#url) | The URL represents the remote object on the World Wide Web to which this connection is opened. |
| protected boolean | [useCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#useCaches) | If `true`, the protocol is allowed to use caching whenever it can. |

### Protected Constructor Summary

|---|---|
|   | [JarURLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#JarURLConnection(java.net.URL))([URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) url) Creates the new JarURLConnection to the specified URL. |

### Public Method Summary

|---|---|
| [Attributes](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/Attributes.html) | [getAttributes](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getAttributes())() Return the Attributes object for this connection if the URL for it points to a JAR file entry, null otherwise. |
| [Certificate\[\]](https://developers.google.com/j2objc/javadoc/jre/reference/java/security/cert/Certificate.html) | [getCertificates](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getCertificates())() Return the Certificate object for this connection if the URL for it points to a JAR file entry, null otherwise. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getEntryName](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getEntryName())() Return the entry name for this connection. |
| [JarEntry](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/JarEntry.html) | [getJarEntry](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarEntry())() Return the JAR entry object for this connection, if any. |
| abstract [JarFile](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/JarFile.html) | [getJarFile](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarFile())() Return the JAR file for this connection. |
| [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) | [getJarFileURL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarFileURL())() Returns the URL for the Jar file for this connection. |
| [Attributes](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/Attributes.html) | [getMainAttributes](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getMainAttributes())() Returns the main Attributes for the JAR file for this connection. |
| [Manifest](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/Manifest.html) | [getManifest](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getManifest())() Returns the Manifest for this connection, or null if none. |

### Inherited Method Summary

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

|---|---|
| void | [addRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#addRequestProperty(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) Adds a general request property specified by a key-value pair. |
| abstract void | [connect](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connect())() Opens a communications link to the resource referenced by this URL, if such a connection has not already been established. |
| boolean | [getAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getAllowUserInteraction())() Returns the value of the `allowUserInteraction` field for this object. |
| int | [getConnectTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getConnectTimeout())() Returns setting for connect timeout. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [getContent](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent())() Retrieves the contents of this URL connection. |
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [getContent](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContent(java.lang.Class[]))([Class\[\]](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html) classes) Retrieves the contents of this URL connection. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getContentEncoding](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentEncoding())() Returns the value of the `content-encoding` header field. |
| int | [getContentLength](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentLength())() Returns the value of the `content-length` header field. |
| long | [getContentLengthLong](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentLengthLong())() Returns the value of the `content-length` header field as a long. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getContentType](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getContentType())() Returns the value of the `content-type` header field. |
| long | [getDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDate())() Returns the value of the `date` header field. |
| static boolean | [getDefaultAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultAllowUserInteraction())() Returns the default value of the `allowUserInteraction` field. |
| static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getDefaultRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultRequestProperty(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key) *This method is deprecated. The instance specific getRequestProperty method should be used after an appropriate instance of URLConnection is obtained.* |
| boolean | [getDefaultUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDefaultUseCaches())() Returns the default value of a `URLConnection`'s `useCaches` flag. |
| boolean | [getDoInput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoInput())() Returns the value of this `URLConnection`'s `doInput` flag. |
| boolean | [getDoOutput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getDoOutput())() Returns the value of this `URLConnection`'s `doOutput` flag. |
| long | [getExpiration](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getExpiration())() Returns the value of the `expires` header field. |
| synchronized static [FileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html) | [getFileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getFileNameMap())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html` implementation suitable for guessing a content type based on a URL's "file" component. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getHeaderField](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name) Returns the value of the named header field. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getHeaderField](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderField(int))(int n) Returns the value for the `n`^th^ header field. |
| long | [getHeaderFieldDate](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldDate(java.lang.String,%20long))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, long Default) Returns the value of the named field parsed as date. |
| int | [getHeaderFieldInt](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldInt(java.lang.String,%20int))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, int Default) Returns the value of the named field parsed as a number. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getHeaderFieldKey](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldKey(int))(int n) Returns the key for the `n`^th^ header field. |
| long | [getHeaderFieldLong](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFieldLong(java.lang.String,%20long))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) name, long Default) Returns the value of the named field parsed as a number. |
| [Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html), [List](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/List.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\>\> | [getHeaderFields](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getHeaderFields())() Returns an unmodifiable Map of the header fields. |
| long | [getIfModifiedSince](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getIfModifiedSince())() Returns the value of this object's `ifModifiedSince` field. |
| [InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) | [getInputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getInputStream())() Returns an input stream that reads from this open connection. |
| long | [getLastModified](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getLastModified())() Returns the value of the `last-modified` header field. |
| [OutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/OutputStream.html) | [getOutputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getOutputStream())() Returns an output stream that writes to this connection. |
| [Permission](https://developers.google.com/j2objc/javadoc/jre/reference/java/security/Permission.html) | [getPermission](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getPermission())() Returns a permission object representing the permission necessary to make the connection represented by this object. |
| int | [getReadTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getReadTimeout())() Returns setting for read timeout. |
| [Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html), [List](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/List.html)\<[String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html)\>\> | [getRequestProperties](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getRequestProperties())() Returns an unmodifiable Map of general request properties for this connection. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [getRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getRequestProperty(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) key) Returns the value of the named general request property for this connection. |
| [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) | [getURL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getURL())() Returns the value of this `URLConnection`'s `URL` field. |
| boolean | [getUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#getUseCaches())() Returns the value of this `URLConnection`'s `useCaches` field. |
| static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [guessContentTypeFromName](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#guessContentTypeFromName(java.lang.String))([String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) fname) Tries to determine the content type of an object, based on the specified "file" component of a URL. |
| static [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [guessContentTypeFromStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#guessContentTypeFromStream(java.io.InputStream))([InputStream](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/InputStream.html) is) Tries to determine the type of an input stream based on the characters at the beginning of the input stream. |
| void | [setAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setAllowUserInteraction(boolean))(boolean allowuserinteraction) Set the value of the `allowUserInteraction` field of this `URLConnection`. |
| void | [setConnectTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setConnectTimeout(int))(int timeout) Sets a specified timeout value, in milliseconds, to be used when opening a communications link to the resource referenced by this URLConnection. |
| synchronized static void | [setContentHandlerFactory](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setContentHandlerFactory(java.net.ContentHandlerFactory))([ContentHandlerFactory](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/ContentHandlerFactory.html) fac) Sets the `ContentHandlerFactory` of an application. |
| static void | [setDefaultAllowUserInteraction](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultAllowUserInteraction(boolean))(boolean defaultallowuserinteraction) Sets the default value of the `allowUserInteraction` field for all future `URLConnection` objects to the specified value. |
| static void | [setDefaultRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultRequestProperty(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) *This method is deprecated. The instance specific setRequestProperty method should be used after an appropriate instance of URLConnection is obtained. Invoking this method will have no effect.* |
| void | [setDefaultUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDefaultUseCaches(boolean))(boolean defaultusecaches) Sets the default value of the `useCaches` field to the specified value. |
| void | [setDoInput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoInput(boolean))(boolean doinput) Sets the value of the `doInput` field for this `URLConnection` to the specified value. |
| void | [setDoOutput](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setDoOutput(boolean))(boolean dooutput) Sets the value of the `doOutput` field for this `URLConnection` to the specified value. |
| static void | [setFileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setFileNameMap(java.net.FileNameMap))([FileNameMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/FileNameMap.html) map) Sets the FileNameMap. |
| void | [setIfModifiedSince](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setIfModifiedSince(long))(long ifmodifiedsince) Sets the value of the `ifModifiedSince` field of this `URLConnection` to the specified value. |
| void | [setReadTimeout](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setReadTimeout(int))(int timeout) Sets the read timeout to a specified timeout, in milliseconds. |
| void | [setRequestProperty](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setRequestProperty(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) Sets the general request property. |
| void | [setUseCaches](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#setUseCaches(boolean))(boolean usecaches) Sets the value of the `useCaches` field of this `URLConnection` to the specified value. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#toString())() Returns a `String` representation of this URL connection. |

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. |

## Fields

#### protected [URLConnection](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html)
**jarFileURLConnection**

The connection to the JAR file URL, if the connection has been
initiated. This should be set by connect.

## Protected Constructors

#### protected
**JarURLConnection**
([URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html) url)

Creates the new JarURLConnection to the specified URL.

##### Parameters

| url | the URL |
|---|---|

##### Throws

| [MalformedURLException](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/MalformedURLException.html) | if no legal protocol could be found in a specification string or the string could not be parsed. |
|---|---|

## Public Methods

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

Return the Attributes object for this connection if the URL
for it points to a JAR file entry, null otherwise.

##### Returns

- the Attributes object for this connection if the URL for it points to a JAR file entry, null otherwise.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if getting the JAR entry causes an IOException to be thrown. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarEntry()`

#### public [Certificate\[\]](https://developers.google.com/j2objc/javadoc/jre/reference/java/security/cert/Certificate.html)
**getCertificates**
()

Return the Certificate object for this connection if the URL
for it points to a JAR file entry, null otherwise. This method
can only be called once
the connection has been completely verified by reading
from the input stream until the end of the stream has been
reached. Otherwise, this method will return `null`

##### Returns

- the Certificate object for this connection if the URL for it points to a JAR file entry, null otherwise.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if getting the JAR entry causes an IOException to be thrown. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarEntry()`

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

Return the entry name for this connection. This method
returns null if the JAR file URL corresponding to this
connection points to a JAR file and not a JAR file entry.

##### Returns

- the entry name for this connection, if any.

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

Return the JAR entry object for this connection, if any. This
method returns null if the JAR file URL corresponding to this
connection points to a JAR file and not a JAR file entry.

##### Returns

- the JAR entry object for this connection, or null if the JAR URL for this connection points to a JAR file.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if getting the JAR file for this connection causes an IOException to be thrown. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarFile()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarEntry()`

#### public abstract [JarFile](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/jar/JarFile.html)
**getJarFile**
()

Return the JAR file for this connection.

##### Returns

- the JAR file for this connection. If the connection is a connection to an entry of a JAR file, the JAR file object is returned

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if an IOException occurs while trying to connect to the JAR file for this connection. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URLConnection.html#connect()`

#### public [URL](https://developers.google.com/j2objc/javadoc/jre/reference/java/net/URL.html)
**getJarFileURL**
()

Returns the URL for the Jar file for this connection.

##### Returns

- the URL for the Jar file for this connection.

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

Returns the main Attributes for the JAR file for this
connection.

##### Returns

- the main Attributes for the JAR file for this connection.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if getting the manifest causes an IOException to be thrown. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarFile()`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getManifest()`

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

Returns the Manifest for this connection, or null if none.

##### Returns

- the manifest object corresponding to the JAR file object for this connection.

##### Throws

| [IOException](https://developers.google.com/j2objc/javadoc/jre/reference/java/io/IOException.html) | if getting the JAR file for this connection causes an IOException to be thrown. |
|---|---|

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/net/JarURLConnection.html#getJarFile()`