# SortedMap

public interface **SortedMap** implements [Map](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html)\<K, V\>

|---|---|---|
| Known Indirect Subclasses [ConcurrentNavigableMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ConcurrentNavigableMap.html)\<K, V\>, [ConcurrentSkipListMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ConcurrentSkipListMap.html)\<K, V\>, [NavigableMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/NavigableMap.html)\<K, V\>, [TreeMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/TreeMap.html)\<K, V\> |---|---| | [ConcurrentNavigableMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ConcurrentNavigableMap.html)\<K, V\> | A `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ConcurrentMap.html` supporting `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/NavigableMap.html` operations, and recursively so for its navigable sub-maps. | | [ConcurrentSkipListMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ConcurrentSkipListMap.html)\<K, V\> | A scalable concurrent `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ConcurrentNavigableMap.html` implementation. | | [NavigableMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/NavigableMap.html)\<K, V\> | A `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html` extended with navigation methods returning the closest matches for given search targets. | | [TreeMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/TreeMap.html)\<K, V\> | A Red-Black tree based `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/NavigableMap.html` implementation. | |||

A `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html` that further provides a *total ordering* on its keys.
The map is ordered according to the {@linkplain Comparable natural
ordering} of its keys, or by a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Comparator.html` typically
provided at sorted map creation time. This order is reflected when
iterating over the sorted map's collection views (returned by the
`entrySet`, `keySet` and `values` methods).
Several additional operations are provided to take advantage of the
ordering. (This interface is the map analogue of `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedSet.html`.)

All keys inserted into a sorted map must implement the `Comparable`
interface (or be accepted by the specified comparator). Furthermore, all
such keys must be *mutually comparable* : `k1.compareTo(k2)` (or
`comparator.compare(k1, k2)`) must not throw a
`ClassCastException` for any keys `k1` and `k2` in
the sorted map. Attempts to violate this restriction will cause the
offending method or constructor invocation to throw a
`ClassCastException`.

Note that the ordering maintained by a sorted map (whether or not an
explicit comparator is provided) must be *consistent with equals* if
the sorted map is to correctly implement the `Map` interface. (See
the `Comparable` interface or `Comparator` interface for a
precise definition of *consistent with equals* .) This is so because
the `Map` interface is defined in terms of the `equals`
operation, but a sorted map performs all key comparisons using its
`compareTo` (or `compare`) method, so two keys that are
deemed equal by this method are, from the standpoint of the sorted map,
equal. The behavior of a tree map *is* well-defined even if its
ordering is inconsistent with equals; it just fails to obey the general
contract of the `Map` interface.

All general-purpose sorted map implementation classes should provide four
"standard" constructors. It is not possible to enforce this recommendation
though as required constructors cannot be specified by interfaces. The
expected "standard" constructors for all sorted map implementations are:

1. A void (no arguments) constructor, which creates an empty sorted map sorted according to the natural ordering of its keys.
2. A constructor with a single argument of type `Comparator`, which creates an empty sorted map sorted according to the specified comparator.
3. A constructor with a single argument of type `Map`, which creates a new map with the same key-value mappings as its argument, sorted according to the keys' natural ordering.
4. A constructor with a single argument of type `SortedMap`, which creates a new sorted map with the same key-value mappings and the same ordering as the input sorted map.

**Note** : several methods return submaps with restricted key
ranges. Such ranges are *half-open* , that is, they include their low
endpoint but not their high endpoint (where applicable). If you need a
*closed range* (which includes both endpoints), and the key type
allows for calculation of the successor of a given key, merely request
the subrange from `lowEndpoint` to
`successor(highEndpoint)`. For example, suppose that `m`
is a map whose keys are strings. The following idiom obtains a view
containing all of the key-value mappings in `m` whose keys are
between `low` and `high`, inclusive:

```
   SortedMap<String, V> sub = m.subMap(low, high+"\0");
```
A similar technique can be used to generate an *open range* (which contains neither endpoint). The following idiom obtains a view containing all of the key-value mappings in `m` whose keys are between `low` and `high`, exclusive:

```
   SortedMap<String, V> sub = m.subMap(low+"\0", high);
```

This interface is a member of the
[Java Collections Framework](https://developers.google.com/j2objc/javadoc/jre/technotes/guides/collections/index.html).

##### See Also

- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/TreeMap.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedSet.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Comparator.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Comparable.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html`
- `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html`

### Public Method Summary

|---|---|
| abstract [Comparator](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Comparator.html)\<? super K\> | [comparator](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#comparator())() Returns the comparator used to order the keys in this map, or `null` if this map uses the {@linkplain Comparable natural ordering} of its keys. |
| 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)\<K, V\>\> | [entrySet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.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 K | [firstKey](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#firstKey())() Returns the first (lowest) key currently in this map. |
| abstract [SortedMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html)\<K, V\> | [headMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#headMap(K))(K toKey) Returns a view of the portion of this map whose keys are strictly less than `toKey`. |
| abstract [Set](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html)\<K\> | [keySet](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#keySet())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html` view of the keys contained in this map. |
| abstract K | [lastKey](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#lastKey())() Returns the last (highest) key currently in this map. |
| abstract [SortedMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html)\<K, V\> | [subMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#subMap(K,%20K))(K fromKey, K toKey) Returns a view of the portion of this map whose keys range from `fromKey`, inclusive, to `toKey`, exclusive. |
| abstract [SortedMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html)\<K, V\> | [tailMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#tailMap(K))(K fromKey) Returns a view of the portion of this map whose keys are greater than or equal to `fromKey`. |
| abstract [Collection](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html)\<V\> | [values](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html#values())() Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html` view of the values contained in this map. |

### Inherited Method Summary

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). |
| V | [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>))(K 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). |
| V | [computeIfAbsent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#computeIfAbsent(K,%20java.util.function.Function<?%20super%20K,%20?%20extends%20V>))(K 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`. |
| V | [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>))(K 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)\<K, V\>\> | [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 V | [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. |
| V | [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, V 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)\<K\> | [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. |
| V | [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>))(K key, V 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 V | [put](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#put(K,%20V))(K key, V 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). |
| V | [putIfAbsent](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#putIfAbsent(K,%20V))(K key, V 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 V | [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))(K key, V oldValue, V newValue) Replaces the entry for the specified key only if currently mapped to the specified value. |
| V | [replace](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Map.html#replace(K,%20V))(K key, V 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)\<V\> | [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. |

## Public Methods

#### public abstract [Comparator](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Comparator.html)\<? super K\>
**comparator**
()

Returns the comparator used to order the keys in this map, or
`null` if this map uses the {@linkplain Comparable
natural ordering} of its keys.

##### Returns

- the comparator used to order the keys in this map, or `null` if this map uses the natural ordering of its keys

#### public 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)\<K, V\>\>
**entrySet**
()

Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html` view of the mappings contained in this map.
The set's iterator returns the entries in ascending key order.
The set is backed by the map, so changes to the map are
reflected in the set, and vice-versa. If the map is modified
while an iteration over the set is in progress (except through
the iterator's own `remove` operation, or through the
`setValue` operation on a map entry returned by the
iterator) the results of the iteration are undefined. The set
supports element removal, which removes the corresponding
mapping from the map, via the `Iterator.remove`,
`Set.remove`, `removeAll`, `retainAll` and
`clear` operations. It does not support the
`add` or `addAll` operations.

##### Returns

- a set view of the mappings contained in this map, sorted in ascending key order

#### public abstract K
**firstKey**
()

Returns the first (lowest) key currently in this map.

##### Returns

- the first (lowest) key currently in this map

##### Throws

| [NoSuchElementException](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/NoSuchElementException.html) | if this map is empty |
|---|---|

#### public abstract [SortedMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html)\<K, V\>
**headMap**
(K toKey)

Returns a view of the portion of this map whose keys are
strictly less than `toKey`. The returned map is backed
by this map, so changes in the returned map are reflected in
this map, and vice-versa. The returned map supports all
optional map operations that this map supports.

The returned map will throw an `IllegalArgumentException`
on an attempt to insert a key outside its range.

##### Parameters

| toKey | high endpoint (exclusive) of the keys in the returned map |
|---|---|

##### Returns

- a view of the portion of this map whose keys are strictly less than `toKey`

##### Throws

| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if `toKey` is not compatible with this map's comparator (or, if the map has no comparator, if `toKey` does not implement `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Comparable.html`). Implementations may, but are not required to, throw this exception if `toKey` cannot be compared to keys currently in the map. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `toKey` is null and this map does not permit null keys |
| [IllegalArgumentException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalArgumentException.html) | if this map itself has a restricted range, and `toKey` lies outside the bounds of the range |
|---|---|

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

Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Set.html` view of the keys contained in this map.
The set's iterator returns the keys in ascending order.
The set is backed by the map, so changes to the map are
reflected in the set, and vice-versa. If the map is modified
while an iteration over the set is in progress (except through
the iterator's own `remove` operation), the results of
the iteration are undefined. The set supports element removal,
which removes the corresponding mapping from the map, via the
`Iterator.remove`, `Set.remove`,
`removeAll`, `retainAll`, and `clear`
operations. It does not support the `add` or `addAll`
operations.

##### Returns

- a set view of the keys contained in this map, sorted in ascending order

#### public abstract K
**lastKey**
()

Returns the last (highest) key currently in this map.

##### Returns

- the last (highest) key currently in this map

##### Throws

| [NoSuchElementException](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/NoSuchElementException.html) | if this map is empty |
|---|---|

#### public abstract [SortedMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html)\<K, V\>
**subMap**
(K fromKey, K toKey)

Returns a view of the portion of this map whose keys range from
`fromKey`, inclusive, to `toKey`, exclusive. (If
`fromKey` and `toKey` are equal, the returned map
is empty.) The returned map is backed by this map, so changes
in the returned map are reflected in this map, and vice-versa.
The returned map supports all optional map operations that this
map supports.

The returned map will throw an `IllegalArgumentException`
on an attempt to insert a key outside its range.

##### Parameters

| fromKey | low endpoint (inclusive) of the keys in the returned map |
| toKey | high endpoint (exclusive) of the keys in the returned map |
|---|---|

##### Returns

- a view of the portion of this map whose keys range from `fromKey`, inclusive, to `toKey`, exclusive

##### Throws

| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if `fromKey` and `toKey` cannot be compared to one another using this map's comparator (or, if the map has no comparator, using natural ordering). Implementations may, but are not required to, throw this exception if `fromKey` or `toKey` cannot be compared to keys currently in the map. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `fromKey` or `toKey` is null and this map does not permit null keys |
| [IllegalArgumentException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalArgumentException.html) | if `fromKey` is greater than `toKey`; or if this map itself has a restricted range, and `fromKey` or `toKey` lies outside the bounds of the range |
|---|---|

#### public abstract [SortedMap](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/SortedMap.html)\<K, V\>
**tailMap**
(K fromKey)

Returns a view of the portion of this map whose keys are
greater than or equal to `fromKey`. The returned map is
backed by this map, so changes in the returned map are
reflected in this map, and vice-versa. The returned map
supports all optional map operations that this map supports.

The returned map will throw an `IllegalArgumentException`
on an attempt to insert a key outside its range.

##### Parameters

| fromKey | low endpoint (inclusive) of the keys in the returned map |
|---|---|

##### Returns

- a view of the portion of this map whose keys are greater than or equal to `fromKey`

##### Throws

| [ClassCastException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/ClassCastException.html) | if `fromKey` is not compatible with this map's comparator (or, if the map has no comparator, if `fromKey` does not implement `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Comparable.html`). Implementations may, but are not required to, throw this exception if `fromKey` cannot be compared to keys currently in the map. |
| [NullPointerException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/NullPointerException.html) | if `fromKey` is null and this map does not permit null keys |
| [IllegalArgumentException](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/IllegalArgumentException.html) | if this map itself has a restricted range, and `fromKey` lies outside the bounds of the range |
|---|---|

#### public abstract [Collection](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html)\<V\>
**values**
()

Returns a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/Collection.html` view of the values contained in this map.
The collection's iterator returns the values in ascending order
of the corresponding keys.
The collection is backed by the map, so changes to the map are
reflected in the collection, and vice-versa. If the map is
modified while an iteration over the collection is in progress
(except through the iterator's own `remove` operation),
the results of the iteration are undefined. The collection
supports element removal, which removes the corresponding
mapping from the map, via the `Iterator.remove`,
`Collection.remove`, `removeAll`,
`retainAll` and `clear` operations. It does not
support the `add` or `addAll` operations.

##### Returns

- a collection view of the values contained in this map, sorted in ascending key order