程序包 java.util

类 AbstractMap.SimpleEntry<K,V>

java.lang.Object

java.util.AbstractMap.SimpleEntry<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.SimpleEntry<K,V>
extends Object
implements Map.Entry<K,V>, Serializable

An Entry maintaining a key and a value. The value may be changed using the setValue method. This class facilitates the process of building custom map implementations. For example, it may be convenient to return arrays of SimpleEntry instances in method Map.entrySet().toArray.

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
SimpleEntry(Map.Entry<? extends K,? extends V> entry)	Creates an entry representing the same mapping as the specified entry.
SimpleEntry(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.
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

SimpleEntry

public SimpleEntry(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

SimpleEntry

public SimpleEntry(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.

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:

the old value corresponding to the entry

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