class LinkedHashSet<E> in Java

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class LinkedHashSet in Java

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обновлено: 17 Augusta 2026

class LinkedHashSet<E> implements interface Set<E>

LinkedHashSet implementation the same as HashSet and additionally maintains a doubly-linked list running through all of its elements. This linked list makes guarantees order of items in the set.

class LinkedHashSet is not synchronized. If multiple threads access a LinkedHashSet concurrently, and at least one of the threads modifies the LinkedHashSet, then LinkedHashSet must be synchronized. Usually this is synchronization, it is done like this:

Set mySet1 = Collections.synchronizedSet( new LinkedHashSet(...) );

Java

class LinkedHashSet<E> extends HashSet<E> implements Set<E>, Cloneable, Serializable
{
     // Constructors
     LinkedHashSet()
     LinkedHashSet(Collection<? extends E> c)
     LinkedHashSet(int initialCapacity)
     LinkedHashSet(int initialCapacity, float loadFactor)

     // Methods
     Spliterator<E> spliterator()

     // Methods inherited from class java.util.HashSet
     boolean add(E e)
     void clear()
     Object clone()
     boolean contains(Object o)
     boolean isEmpty()
     Iterator<E> iterator()
     boolean remove(Object o)
     int size()

     // Methods inherited from class java.util.AbstractSet
     boolean equals(Object o)
     int hashCode()
     boolean removeAll(Collection<?> c)

     // Methods inherited from class java.util.AbstractCollection
     boolean addAll(Collection<? extends E> c)
     boolean containsAll(Collection<?> c)
     boolean retainAll(Collection<?> c)
     Object[] toArray()
     <T> T[] toArray(T[] a)
     String toString()

     // Methods inherited from class java.lang.Object
     void finalize()
     Class<?> getClass()
     void notify()
     void notifyAll()
     void wait()
     void wait(long timeout)
     void wait(long timeout, int nanos)

     // Methods inherited from interface java.util.Set
     boolean add(E e)
     boolean addAll(Collection<? extends E> c)
     void clear()
     boolean contains(Object o)
     boolean containsAll(Collection<?> c)
     boolean equals(Object o)
     int hashCode()
     boolean isEmpty()
     Iterator<E> iterator()
     boolean remove(Object o)
     boolean removeAll(Collection<?> c)
     boolean retainAll(Collection<?> c)
     int size()
     Object[] toArray()
     <T> T[] toArray(T[] a)

     // Methods inherited from interface java.util.Collection
     Stream<E> parallelStream()
     boolean removeIf(Predicate<? super E> filter)
     Stream<E> stream()

     // Methods inherited from interface java.lang.Iterable
     void forEach(Consumer<? super T> action)
}

Learn more about methods in the Java documentation:https://docs.oracle.com ...

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