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Showing content from https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/util/HashMap.html below:

HashMap (Java SE 24 & JDK 24)

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:

LinkedHashMap, PrinterStateReasons

• Nested Class Summary Nested classes/interfaces declared in interface java.util.MapMap.Entry<K,V>
• Constructor Summary

  Constructors

  Constructs an empty HashMap with the default initial capacity (16) and the default load factor (0.75).

  Constructs an empty HashMap with the specified initial capacity and the default load factor (0.75).

  HashMap(int initialCapacity, float loadFactor)

  Constructs an empty HashMap with the specified initial capacity and load factor.

  Constructs a new HashMap with the same mappings as the specified Map.

• Method Summary

  void

  Removes all of the mappings from this map.

  Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.

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

  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).

  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

  Returns true if this map contains a mapping for the specified key.

  boolean

  Returns true if this map maps one or more keys to the specified value.

  Returns a

  Set

  view of the mappings contained in this map.

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

  boolean

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

  Returns a

  Set

  view of the keys contained in this map.

  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).

  Creates a new, empty HashMap suitable for the expected number of mappings.

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

  void

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

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

  int

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

  Returns a

  Collection

  view of the values contained in this map.

• Constructor Details
  • HashMap
  • HashMap
  • HashMap
  • HashMap
• Method Details
  • size
  • isEmpty
  • get
  • containsKey
  • put
  • putAll
  • remove
  • clear
  • containsValue
  • keySet
  • values
  • entrySet
  • computeIfAbsent
  • computeIfPresent
  • compute
  • merge
  • clone
  • newHashMap

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