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AbstractMap.SimpleEntry

public static class AbstractMap.SimpleEntry
extends Object implements Entry<K, V>, Serializable

java.lang.Object
↳	java.util.AbstractMap.SimpleEntry<K, V>

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.

Summary

Public constructors
`SimpleEntry(K key, V value)` Creates an entry representing a mapping from the specified key to the specified value.
`SimpleEntry(Entry<? extends K, ? extends V> entry)` Creates an entry representing the same mapping as the specified entry.

Public methods
`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.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

From interface


        
          java.util.Map.Entry

`static <K, V> Comparator<Entry<K, V>>`	`comparingByKey(Comparator<? super K> cmp)` Returns a comparator that compares `Map.Entry` by key using the given `Comparator`.
`static <K extends Comparable<? super K>, V> Comparator<Entry<K, V>>`	`comparingByKey()` Returns a comparator that compares `Map.Entry` in natural order on key.
`static <K, V> Comparator<Entry<K, V>>`	`comparingByValue(Comparator<? super V> cmp)` Returns a comparator that compares `Map.Entry` by value using the given `Comparator`.
`static <K, V extends Comparable<? super V>> Comparator<Entry<K, V>>`	`comparingByValue()` Returns a comparator that compares `Map.Entry` in natural order on value.
`abstract boolean`	`equals(Object o)` Compares the specified object with this entry for equality.
`abstract K`	`getKey()` Returns the key corresponding to this entry.
`abstract V`	`getValue()` Returns the value corresponding to this entry.
`abstract int`	`hashCode()` Returns the hash code value for this map entry.
`abstract V`	`setValue(V value)` Replaces the value corresponding to this entry with the specified value (optional operation).

Public constructors

SimpleEntry

public SimpleEntry (K key, 
                V value)

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

Parameters
`key`	`K`: the key represented by this entry
`value`	`V`: the value represented by this entry

SimpleEntry

public SimpleEntry (Entry<? extends K, ? extends V> entry)

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

Parameters
`entry`	`Entry`: the entry to copy

Public methods

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.

Parameters
`o`	`Object`: object to be compared for equality with this map entry

Returns
`boolean`	`true` if the specified object is equal to this map entry

See also:

hashCode()

getKey

public K getKey ()

Returns the key corresponding to this entry.

Returns
`K`	the key corresponding to this entry

getValue

public V getValue ()

Returns the value corresponding to this entry.

Returns
`V`	the value corresponding to this entry

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.

Returns
`int`	the hash code value for this map entry

See also:

equals(Object)

setValue

public V setValue (V value)

Replaces the value corresponding to this entry with the specified value.

Parameters
`value`	`V`: new value to be stored in this entry

Returns
`V`	the old value corresponding to the entry

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.

Returns
`String`	a String representation of this map entry

Interfaces

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AbstractMap.SimpleEntry

Summary

Public constructors

Public methods

Inherited methods

Public constructors

SimpleEntry

SimpleEntry

Public methods

equals

getKey

getValue

hashCode

setValue

toString