Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Java™ Platform Standard Ed. 6
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## java.util
Class AbstractMap.SimpleImmutableEntry<K,V>

    java.lang.Object
      java.util.AbstractMap.SimpleImmutableEntry<K,V>

All Implemented Interfaces:
  Serializable, Map.Entry<K,V>

Enclosing class:
  AbstractMap<K,V>

    public static class AbstractMap.SimpleImmutableEntry<K,V>

extends Object
implements Map.Entry<K,V>, Serializable

An Entry maintaining an immutable key and value. This class does not support method `setValue`. This class may be convenient in methods that return thread-safe snapshots of key-value mappings.

Since:
  1.6
See Also:
  Serialized Form

Constructor Summary
`AbstractMap.SimpleImmutableEntry(K key, V value)` Creates an entry representing a mapping from the specified key to the specified value.
`AbstractMap.SimpleImmutableEntry(Map.Entry<? extends K,? extends V> entry)` Creates an entry representing the same mapping as the specified entry.

Method Summary
`boolean` | `equals(Object o)` Compares the specified object with this entry for equality.
`K` | `getKey()` Returns the key corresponding to this entry.
`V` | `getValue()` Returns the value corresponding to this entry.
`int` | `hashCode()` Returns the hash code value for this map entry.
`V` | `setValue(V value)` Replaces the value corresponding to this entry with the specified value (optional operation).
`String` | `toString()` Returns a String representation of this map entry.

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### AbstractMap.SimpleImmutableEntry

    public AbstractMap.SimpleImmutableEntry(K key,
                                            V value)

  Creates an entry representing a mapping from the specified key to the specified value.

  Parameters:
    `key` - the key represented by this entry
    `value` - the value represented by this entry

### AbstractMap.SimpleImmutableEntry

    public AbstractMap.SimpleImmutableEntry(Map.Entry<? extends K,? extends V> entry)

  Creates an entry representing the same mapping as the specified entry.

  Parameters:
    `entry` - the entry to copy

Method Detail

### getKey

    public K getKey()

  Returns the key corresponding to this entry.

  Specified by:
    `getKey` in interface `Map.Entry<K,V>`
  Returns:
    the key corresponding to this entry

### getValue

    public V getValue()

  Returns the value corresponding to this entry.

  Specified by:
    `getValue` in interface `Map.Entry<K,V>`
  Returns:
    the value corresponding to this entry

### setValue

    public V setValue(V value)

  Replaces the value corresponding to this entry with the specified value (optional operation). This implementation simply throws `UnsupportedOperationException`, as this class implements an immutable map entry.

  Specified by:
    `setValue` in interface `Map.Entry<K,V>`
  Parameters:
    `value` - new value to be stored in this entry
  Returns:
    (Does not return)
  Throws:
    `UnsupportedOperationException` - always

### equals

    public boolean equals(Object o)

  Compares the specified object with this entry for equality. Returns `true` if the given object is also a map entry and the two entries represent the same mapping. More formally, two entries `e1` and `e2` represent the same mapping if

         (e1.getKey()==null ?
          e2.getKey()==null :
          e1.getKey().equals(e2.getKey()))
         &&
         (e1.getValue()==null ?
          e2.getValue()==null :
          e1.getValue().equals(e2.getValue()))

  This ensures that the `equals` method works properly across different implementations of the `Map.Entry` interface.

  Specified by:
    `equals` in interface `Map.Entry<K,V>`
  Overrides:
    `equals` in class `Object`
  Parameters:
    `o` - object to be compared for equality with this map entry
  Returns:
    `true` if the specified object is equal to this map entry
  See Also:
    `hashCode()`

### hashCode

    public int hashCode()

  Returns the hash code value for this map entry. The hash code of a map entry `e` is defined to be:

         (e.getKey()==null   ? 0 : e.getKey().hashCode()) ^
         (e.getValue()==null ? 0 : e.getValue().hashCode())

  This ensures that `e1.equals(e2)` implies that `e1.hashCode()==e2.hashCode()` for any two Entries `e1` and `e2`, as required by the general contract of `Object.hashCode()`.

  Specified by:
    `hashCode` in interface `Map.Entry<K,V>`
  Overrides:
    `hashCode` in class `Object`
  Returns:
    the hash code value for this map entry
  See Also:
    `equals(java.lang.Object)`

### toString

    public String toString()

  Returns a String representation of this map entry. This implementation returns the string representation of this entry's key followed by the equals character ("`=`") followed by the string representation of this entry's value.

  Overrides:
    `toString` in class `Object`
  Returns:
    a String representation of this map entry

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Java™ Platform Standard Ed. 6
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Submit a bug or feature
For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright © 1993, 2011, Oracle and/or its affiliates. All rights reserved.