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AbstractMap.SimpleImmutableEntry

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

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

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.

Summary

Public constructors
`SimpleImmutableEntry(K key, V value)` Creates an entry representing a mapping from the specified key to the specified value.
`SimpleImmutableEntry(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 (optional operation).
`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

SimpleImmutableEntry

public SimpleImmutableEntry (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

SimpleImmutableEntry

public SimpleImmutableEntry (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 (optional operation). This implementation simply throws UnsupportedOperationException, as this class implements an immutable map entry.

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

Returns
`V`	(Does not return)

Throws
`UnsupportedOperationException`	always

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.SimpleImmutableEntry

Summary

Public constructors

Public methods

Inherited methods

Public constructors

SimpleImmutableEntry

SimpleImmutableEntry

Public methods

equals

getKey

getValue

hashCode

setValue

toString