程序包 java.util

类 AbstractMap.SimpleImmutableEntry<K,V>

java.lang.Object

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

所有已实现的接口:

Serializable, Map.Entry<K,V>

封闭类:

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.

从以下版本开始:

1.6

另请参阅:

序列化表格

构造器概要

构造器

构造器	说明
SimpleImmutableEntry(Map.Entry<? extends K,? extends V> entry)	Creates an entry representing the same mapping as the specified entry.
SimpleImmutableEntry(K key, V value)	Creates an entry representing a mapping from the specified key to the specified value.

方法概要

限定符和类型	方法	说明
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.

从接口继承的方法 java.util.Map.Entry

comparingByKey, comparingByKey, comparingByValue, comparingByValue

从类继承的方法 java.lang.Object

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

构造器详细资料

SimpleImmutableEntry

public SimpleImmutableEntry(K key,
                            V value)

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

参数:

key - the key represented by this entry

value - the value represented by this entry

SimpleImmutableEntry

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

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

参数:

entry - the entry to copy

方法详细资料

getKey

public K getKey()

Returns the key corresponding to this entry.

指定者:

getKey 在接口中 Map.Entry<K,V>

返回:

the key corresponding to this entry

getValue

public V getValue()

Returns the value corresponding to this entry.

指定者:

getValue 在接口中 Map.Entry<K,V>

返回:

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.

指定者:

setValue 在接口中 Map.Entry<K,V>

参数:

value - new value to be stored in this entry

返回:

(Does not return)

抛出:

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.

指定者:

equals 在接口中 Map.Entry<K,V>

覆盖:

equals 在类中 Object

参数:

o - object to be compared for equality with this map entry

返回:

true if the specified object is equal to this map entry

另请参阅:

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.

指定者:

hashCode 在接口中 Map.Entry<K,V>

覆盖:

hashCode 在类中 Object

返回:

the hash code value for this map entry

另请参阅:

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.

覆盖:

toString 在类中 Object

返回:

a String representation of this map entry