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>
Direct Known Subclasses:
Properties, UIDefaults

  • Constructor Summary

    Constructors

    Hashtable()

    Constructs a new, empty hashtable with a default initial capacity (11) and load factor (0.75).

    Hashtable(int initialCapacity)

    Constructs a new, empty hashtable with the specified initial capacity and default load factor (0.75).

    Hashtable(int initialCapacity, float loadFactor)

    Constructs a new, empty hashtable with the specified initial capacity and the specified load factor.

    Hashtable(Map<? extends K, ? extends V> t)

    Constructs a new hashtable with the same mappings as the given Map.

  • Method Summary

    void

    clear()

    Clears this hashtable so that it contains no keys.

    clone()

    Creates a shallow copy of this hashtable.

    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).

    computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction)

    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).

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

    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).

    boolean

    Tests if some key maps into the specified value in this hashtable.

    boolean

    Tests if the specified object is a key in this hashtable.

    boolean

    Returns true if this hashtable maps one or more keys to this value.

    elements()

    Returns an enumeration of the values in this hashtable.

    entrySet()

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

    boolean

    Compares the specified Object with this Map for equality, as per the definition in the Map interface.

    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 as per the definition in the Map interface.

    boolean

    isEmpty()

    Tests if this hashtable maps no keys to values.

    keys()

    Returns an enumeration of the keys in this hashtable.

    keySet()

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

    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).

    put(K key, V value)

    Maps the specified key to the specified value in this hashtable.

    void

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

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

    protected void

    rehash()

    Increases the capacity of and internally reorganizes this hashtable, in order to accommodate and access its entries more efficiently.

    Removes the key (and its corresponding value) from this hashtable.

    int

    size()

    Returns the number of keys in this hashtable.

    toString()

    Returns a string representation of this Hashtable object in the form of a set of entries, enclosed in braces and separated by the ASCII characters " , " (comma and space).

    values()

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

  • Constructor Details

    • Hashtable

    • Hashtable

    • Hashtable

    • Hashtable

  • Method Details

    • size

    • isEmpty

    • keys

    • elements

    • contains

    • containsValue

    • containsKey

    • get

    • rehash

    • put

    • remove

    • putAll

    • clear

    • clone

    • toString

    • keySet

    • entrySet

    • values

    • equals

    • hashCode

    • computeIfAbsent

    • computeIfPresent

    • compute

    • merge