![]() forEach(): Performs the given action for each entry in this map until all entries have been processed or the action throws an exception.entrySet(): Returns a Set view of the mappings contained in this map.containsValue(Object value): Returns true if this map maps one or more keys to the specified value.containsKey(Object key): Returns true if this map contains a mapping for the specified key.computeIfPresent(K key, BiFunction 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.computeIfAbsent(K key, Function 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.compute(K key, BiFunction remappingFunction): Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).clone(): Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.clear(): Removes all of the mappings from this map.Important methods in Java HashMapįollowing are the method present in class. HashMap class extends AbstractMap class and implements Map interface. The initial default capacity of Java HashMap class is 16 with a load factor of 0.75. ![]() ![]() Java HashMap class is non-synchronized.Java HashMap class may have one null key and multiple null values.Java HashMap class contains only unique keys.Java HashMap class contains values based on the key.loadFactor: represents the percentage of how full the hash table can be, before increasing its capacity.initialCapacity: is the initial number of buckets of the hash table, where its default value is 16.HashMap(Map m): a constructor of a new HashMap that includes the specified mapping.HashMap(int initialCapacity, float loadFactor): constructs an empty HashMap, specified by the initialCapacity and loadFactor.HashMap(int initialCapacity): constructs an empty HashMap, in which initialCapacity is specified but load factor has its default value.HashMap(): empty constructor with default values for initialCapacity and loadFactor.HashMap includes some different expressions for its constructor: K: specifies the type of keys maintained by this map.The general expression of HashMap Class is Class HashMap, where:
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