Type Parameters:
K - the type of keys maintained by this map
V - the type of mapped values
All Implemented Interfaces:
Serializable, Cloneable, Map<K,V>

  • Nested Class Summary

    Nested classes/interfaces declared in interface Map

    Map.Entry<K,V>

    static interface 

    A map entry (key-value pair).

  • Constructor Summary

    Constructors

    Constructs a new, empty identity hash map with a default expected maximum size (21).

    IdentityHashMap(int expectedMaxSize)

    Constructs a new, empty map with the specified expected maximum size.

    IdentityHashMap(Map<? extends K, ? extends V> m)

    Constructs a new identity hash map containing the key-value mappings in the specified map.

  • Method Summary

    void

    clear()

    Removes all of the mappings from this map.

    clone()

    Returns a shallow copy of this identity hash map: the keys and values themselves are not cloned.

    boolean

    Tests whether the specified object reference is a key in this identity hash map.

    boolean

    Tests whether the specified object reference is a value in this identity hash map.

    entrySet()

    Returns a Set view of the mappings contained in this map.

    boolean

    Compares the specified object with this map for equality.

    Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.

    int

    hashCode()

    Returns the hash code value for this map.

    boolean

    isEmpty()

    Returns true if this identity hash map contains no key-value mappings.

    keySet()

    Returns an identity-based set view of the keys contained in this map.

    put(K key, V value)

    Associates the specified value with the specified key in this identity hash map.

    void

    putAll(Map<? extends K, ? extends V> m)

    Copies all of the mappings from the specified map to this map.

    Removes the mapping for this key from this map if present.

    boolean

    Removes the entry for the specified key only if it is currently mapped to the specified value (optional operation).

    boolean

    replace(K key, V oldValue, V newValue)

    Replaces the entry for the specified key only if currently mapped to the specified value (optional operation).

    int

    size()

    Returns the number of key-value mappings in this identity hash map.

    values()

    Returns a Collection view of the values contained in this map.

    Methods declared in class Object

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

    protected void

    Deprecated, for removal: This API element is subject to removal in a future version.

    Returns the runtime class of this Object.

    final void

    Wakes up a single thread that is waiting on this object's monitor.

    final void

    Wakes up all threads that are waiting on this object's monitor.

    final void

    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

    final void

    wait(long timeoutMillis)

    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

    final void

    wait(long timeoutMillis, int nanos)

    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

    Methods declared in interface Map

    compute, computeIfAbsent, computeIfPresent, forEach, getOrDefault, merge, putIfAbsent, replace, replaceAll

    default V

    compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction)

    Attempts to compute a mapping for the specified key and its current mapped value, or null if there is no current mapping (optional operation).

    default V

    If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function and enters it into this map unless null (optional operation).

    default V

    If the value for the specified key is present and non-null, attempts to compute a new mapping given the key and its current mapped value (optional operation).

    default void

    Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.

    default V

    Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.

    default V

    merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction)

    If the specified key is not already associated with a value or is associated with null, associates it with the given non-null value (optional operation).

    default V

    If the specified key is not already associated with a value (or is mapped to null) associates it with the given value and returns null, else returns the current value (optional operation).

    default V

    Replaces the entry for the specified key only if it is currently mapped to some value (optional operation).

    default void

    Replaces each entry's value with the result of invoking the given function on that entry until all entries have been processed or the function throws an exception (optional operation).

  • Constructor Details

    • IdentityHashMap

    • IdentityHashMap

    • IdentityHashMap

  • Method Details

    • size

    • isEmpty

    • get

    • containsKey

    • containsValue

    • put

    • putAll

    • remove

    • clear

    • equals

    • hashCode

    • clone

    • keySet

    • values

    • entrySet

    • remove

    • replace