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java.util
Class AbstractMap.BasicMapEntry  

java.lang.Object
  java.util.AbstractMap.BasicMapEntry

All Implemented Interfaces:

Map.Entry

Direct Known Subclasses:

HashMap.HashEntry, Hashtable.HashEntry, TreeMap.Node

Enclosing class:

AbstractMap

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static class AbstractMap.BasicMapEntry

extends java.lang.Object

implements Map.Entry

A class which implements Map.Entry. It is shared by HashMap, TreeMap, Hashtable, and Collections. It is not specified by the JDK, but makes life much easier.

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Field Summary
(package private)  java.lang.Object	key           The key.
(package private)  java.lang.Object	value           The value.

 

Constructor Summary
(package private)	AbstractMap.BasicMapEntry(java.lang.Object newKey, java.lang.Object newValue)           Basic constructor initializes the fields.

 

Method Summary
boolean	equals(java.lang.Object o)           Compares the specified object with this entry.
java.lang.Object	getKey()           Get the key corresponding to this entry.
java.lang.Object	getValue()           Get the value corresponding to this entry.
int	hashCode()           Returns the hash code of the entry.
java.lang.Object	setValue(java.lang.Object newVal)           Replaces the value with the specified object.
java.lang.String	toString()           This provides a string representation of the entry.

 

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

 

Field Detail

key

java.lang.Object key

The key. Package visible for direct manipulation.

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value

java.lang.Object value

The value. Package visible for direct manipulation.

Constructor Detail

AbstractMap.BasicMapEntry

AbstractMap.BasicMapEntry(java.lang.Object newKey,
                          java.lang.Object newValue)

Basic constructor initializes the fields.

Method Detail

equals

public final boolean equals(java.lang.Object o)

Compares the specified object with this entry. Returns true only if the object is a mapping of identical key and value. In other words, this must be:

(o instanceof Map.Entry)
       && (getKey() == null ? ((HashMap) o).getKey() == null
           : getKey().equals(((HashMap) o).getKey()))
       && (getValue() == null ? ((HashMap) o).getValue() == null
           : getValue().equals(((HashMap) o).getValue()))

Specified by:

equals in interface Map.Entry

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getKey

public final java.lang.Object getKey()

Get the key corresponding to this entry.

Specified by:

getKey in interface Map.Entry

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getValue

public final java.lang.Object getValue()

Get the value corresponding to this entry. If you already called Iterator.remove(), the behavior undefined, but in this case it works.

Specified by:

getValue in interface Map.Entry

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hashCode

public final int hashCode()

Returns the hash code of the entry. This is defined as the exclusive-or of the hashcodes of the key and value (using 0 for null). In other words, this must be:

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

Specified by:

hashCode in interface Map.Entry

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setValue

public java.lang.Object setValue(java.lang.Object newVal)

Replaces the value with the specified object. This writes through to the map, unless you have already called Iterator.remove(). It may be overridden to restrict a null value.

Specified by:

setValue in interface Map.Entry

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toString

public final java.lang.String toString()

This provides a string representation of the entry. It is of the form "key=value", where string concatenation is used on key and value.

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