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## org.apache.commons.collections.keyvalue
Class DefaultKeyValue

    java.lang.Object
      |
      +--org.apache.commons.collections.keyvalue.AbstractKeyValue
            |
            +--org.apache.commons.collections.keyvalue.DefaultKeyValue

All Implemented Interfaces:
  KeyValue

public class DefaultKeyValue
extends AbstractKeyValue

A mutable KeyValue pair that does not implement MapEntry.

Note that a `DefaultKeyValue` instance may not contain itself as a key or value.

Since:
  Commons Collections 3.0
Version:
  $Revision: 1.4 $ $Date: 2004/02/18 01:00:08 $
Author:
  James Strachan, Michael A. Smith, Neil O'Toole, Stephen Colebourne

Field Summary

Fields inherited from class org.apache.commons.collections.keyvalue.AbstractKeyValue
`key, value`

Constructor Summary
`DefaultKeyValue()` Constructs a new pair with a null key and null value.
`DefaultKeyValue(KeyValue pair)` Constructs a new pair from the specified KeyValue.
`DefaultKeyValue(Map.Entry entry)` Constructs a new pair from the specified MapEntry.
`DefaultKeyValue(Object key, Object value)` Constructs a new pair with the specified key and given value.

Method Summary
`boolean` | `equals(Object obj)` Compares this Map Entry with another Map Entry.
`int` | `hashCode()` Gets a hashCode compatible with the equals method.
`Object` | `setKey(Object key)` Sets the key.
`Object` | `setValue(Object value)` Sets the value.
`Map.Entry` | `toMapEntry()` Returns a new `Map.Entry` object with key and value from this pair.

Methods inherited from class org.apache.commons.collections.keyvalue.AbstractKeyValue
`getKey, getValue, toString`

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

Constructor Detail

### DefaultKeyValue

    public DefaultKeyValue()

  Constructs a new pair with a null key and null value.

### DefaultKeyValue

    public DefaultKeyValue(Object key,
                           Object value)

  Constructs a new pair with the specified key and given value.

Parameters:
  `key` - the key for the entry, may be null
  `value` - the value for the entry, may be null

### DefaultKeyValue

    public DefaultKeyValue(KeyValue pair)

  Constructs a new pair from the specified KeyValue.

Parameters:
  `pair` - the pair to copy, must not be null
Throws:
  `NullPointerException` - if the entry is null

### DefaultKeyValue

    public DefaultKeyValue(Map.Entry entry)

  Constructs a new pair from the specified MapEntry.

Parameters:
  `entry` - the entry to copy, must not be null
Throws:
  `NullPointerException` - if the entry is null

Method Detail

### setKey

    public Object setKey(Object key)

  Sets the key.

  Parameters:
    `key` - the new key
  Returns:
    the old key
  Throws:
    `IllegalArgumentException` - if key is this object

### setValue

    public Object setValue(Object value)

  Sets the value.

  Parameters:
    `value` - the new value
  Returns:
    the old value of the value
  Throws:
    `IllegalArgumentException` - if value is this object

### toMapEntry

    public Map.Entry toMapEntry()

  Returns a new `Map.Entry` object with key and value from this pair.

  Returns:
    a MapEntry instance

### equals

    public boolean equals(Object obj)

  Compares this Map Entry with another Map Entry.

  Returns true if the compared object is also a `DefaultKeyValue`, and its key and value are equal to this object's key and value.

  Overrides:
    `equals` in class `Object`
  Parameters:
    `obj` - the object to compare to
  Returns:
    true if equal key and value

### hashCode

    public int hashCode()

  Gets a hashCode compatible with the equals method.

  Implemented per API documentation of `Map.Entry.hashCode()`, however subclasses may override this.

  Overrides:
    `hashCode` in class `Object`
  Returns:
    a suitable hash code

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Copyright © 2001-2004 Apache Software Foundation. All Rights Reserved.