Java java.util HashSet fields, constructors, methods, implement or subclass

Introduction

In this page you can find the methods, fields and constructors for java.util HashSet.

The text is from its open source code.

Subclass

java.util.HashSet has subclasses.
Click this link to see all its subclasses.

Constructor

	HashSet() Constructs a new, empty set; the backing HashMap instance has default initial capacity (16) and load factor (0.75).
	HashSet(Collection c) Constructs a new set containing the elements in the specified collection.
	HashSet(int initialCapacity) Constructs a new, empty set; the backing HashMap instance has the specified initial capacity and default load factor (0.75).
	HashSet(int initialCapacity, float loadFactor) Constructs a new, empty set; the backing HashMap instance has the specified initial capacity and the specified load factor.

Method

boolean	add(E e) Adds the specified element to this set if it is not already present.
boolean	addAll(Collection c) Adds all of the elements in the specified collection to this set if they're not already present (optional operation).
void	clear() Removes all of the elements from this set.
Object	clone() Returns a shallow copy of this HashSet instance: the elements themselves are not cloned.
boolean	contains(Object o) Returns true if this set contains the specified element.
boolean	containsAll(Collection c) Returns true if this set contains all of the elements of the specified collection.
boolean	equals(Object o) Compares the specified object with this set for equality.
void	forEach(Consumer action) Performs the given action for each element of the Iterable until all elements have been processed or the action throws an exception.
int	hashCode() Returns the hash code value for this set.
boolean	isEmpty() Returns true if this set contains no elements.
Iterator	iterator() Returns an iterator over the elements in this set.
Stream	parallelStream() Returns a possibly parallel Stream with this collection as its source.
boolean	remove(Object o) Removes the specified element from this set if it is present.
boolean	removeAll(Collection c) Removes from this set all of its elements that are contained in the specified collection (optional operation).
boolean	removeIf(Predicate filter) Removes all of the elements of this collection that satisfy the given predicate.
boolean	retainAll(Collection c) Retains only the elements in this set that are contained in the specified collection (optional operation).
int	size() Returns the number of elements in this set (its cardinality).
Stream	stream() Returns a sequential Stream with this collection as its source.
Object[]	toArray() Returns an array containing all of the elements in this set.
T[]	toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
String	toString() Returns a string representation of the object.