- clear()
Removes all mappings from the map.public void clear()- clone()
Returns a shallow copy of the HashMap.public Object clone()- compute()
Attempts to compute a new mapping for the specified key.public V compute(K key, BiFunction remappingFunction)- computeIfAbsent()
Computes and stores a value for the key if it is not already present.public V computeIfAbsent(K key, Function mappingFunction)- computeIfPresent()
Updates the value only if the key is already present.public V computeIfPresent(K key, BiFunction remappingFunction)- containsKey()
Checks if the map contains the specified key.public boolean containsKey(Object key)- containsValue()
Checks if the map maps one or more keys to the specified value.public boolean containsValue(Object value)- entrySet()
Returns a set view of the key-value mappings.public Set- forEach()
Performs an action for each entry in the map.public void forEach(BiConsumer action)- get()
Returns the value to which the specified key is mapped, or null.public V get(Object key)- getOrDefault()
Returns the value for the key, or a default if the key is not present.public V getOrDefault(Object key, V defaultValue)- isEmpty()
Checks if the map contains no key-value mappings.public boolean isEmpty()- keySet()
Returns a Set view of the keys contained in the map.public SetkeySet() - merge()
Merges the value with existing value using a mapping function.public V merge(K key, V value, BiFunction remappingFunction)- put()
Associates the specified value with the specified key in the map.public V put(K key, V value)- putAll()
Copies all of the mappings from the specified map to this map.public void putAll(Map m)- putIfAbsent()
Puts the value only if the key is not already associated with a value.public V putIfAbsent(K key, V value)- remove()
Removes the mapping for the specified key or key-value pair.public V remove(Object key)public boolean remove(Object key, Object value)- replace()
Replaces the entry for the specified key if it is currently mapped.public V replace(K key, V value)public boolean replace(K key, V oldValue, V newValue)- replaceAll()
Replaces each entry’s value using the provided function.public void replaceAll(BiFunction function)- size()
Returns the number of key-value mappings in the map.public int size()- values()
Returns a Collection view of the values contained in the map.public Collectionvalues()
Java HashMap Methods Reference
