Package java.util

Class AbstractMap.SimpleEntry<K,​V>

java.lang.Object
java.util.AbstractMap.SimpleEntry<K,​V>
All Implemented Interfaces:
Serializable, Map.Entry<K,​V>
Enclosing class:
AbstractMap<K,​V>
public static class AbstractMap.SimpleEntry<K,​V>
extends Object
implements Map.Entry<K,​V>, Serializable
A key-value mapping with mutable values.
Since:
1.6
See Also:
Serialized Form

  • Constructor Summary

    Constructors
    Constructor Description
    SimpleEntry​(Map.Entry<? extends K,​? extends V> copyFrom)
    Constructs an instance with the key and value of copyFrom.
    SimpleEntry​(K theKey, V theValue)  

  • Method Summary

    Modifier and Type Method Description
    boolean equals​(Object object)
    Compares this instance with the specified object and indicates if they are equal.
    K getKey()
    Returns the key.
    V getValue()
    Returns the value.
    int hashCode()
    Returns an integer hash code for this object.
    V setValue​(V object)
    Sets the value of this entry to the specified value, replacing any existing value.
    String toString()
    Returns a string containing a concise, human-readable description of this object.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • SimpleEntry

      public SimpleEntry​(K theKey, V theValue)

    • SimpleEntry

      public SimpleEntry​(Map.Entry<? extends K,​? extends V> copyFrom)
      Constructs an instance with the key and value of copyFrom.

  • Method Details

    • getKey

      public K getKey()
      Description copied from interface: Map.Entry
      Returns the key.
      Specified by:
      getKey in interface Map.Entry<K,​V>
      Returns:
      the key

    • getValue

      public V getValue()
      Description copied from interface: Map.Entry
      Returns the value.
      Specified by:
      getValue in interface Map.Entry<K,​V>
      Returns:
      the value

    • setValue

      public V setValue​(V object)
      Description copied from interface: Map.Entry
      Sets the value of this entry to the specified value, replacing any existing value.
      Specified by:
      setValue in interface Map.Entry<K,​V>
      Parameters:
      object - the new value to set.
      Returns:
      object the replaced value of this entry.

    • equals

      public boolean equals​(Object object)
      Description copied from class: Object
      Compares this instance with the specified object and indicates if they are equal. In order to be equal, o must represent the same object as this instance using a class-specific comparison. The general contract is that this comparison should be reflexive, symmetric, and transitive. Also, no object reference other than null is equal to null.

      The default implementation returns true only if this == o. See Writing a correct equals method if you intend implementing your own equals method.

      The general contract for the equals and Object.hashCode() methods is that if equals returns true for any two objects, then hashCode() must return the same value for these objects. This means that subclasses of Object usually override either both methods or neither of them.

      Specified by:
      equals in interface Map.Entry<K,​V>
      Overrides:
      equals in class Object
      Parameters:
      object - the object to compare this instance with.
      Returns:
      true if the specified object is equal to this Object; false otherwise.
      See Also:
      Object.hashCode()

    • hashCode

      public int hashCode()
      Description copied from class: Object
      Returns an integer hash code for this object. By contract, any two objects for which Object.equals(java.lang.Object) returns true must return the same hash code value. This means that subclasses of Object usually override both methods or neither method.

      Note that hash values must not change over time unless information used in equals comparisons also changes.

      See Writing a correct hashCode method if you intend implementing your own hashCode method.

      Specified by:
      hashCode in interface Map.Entry<K,​V>
      Overrides:
      hashCode in class Object
      Returns:
      this object's hash code.
      See Also:
      Object.equals(java.lang.Object)

    • toString

      public String toString()
      Description copied from class: Object
      Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression: 
         getClass().getName() + '@' + Integer.toHexString(hashCode())

      See Writing a useful toString method if you intend implementing your own toString method.

      Overrides:
      toString in class Object
      Returns:
      a printable representation of this object.