LinkedHashSet

Class Overview

LinkedHashSet is a variant on HashSet. Its entries are kept in a doubly-linked list. The iteration order is the order in which entries were inserted.

Null elements are allowed, and all the optional Set operations are supported.

Like HashSet, LinkedHashSet is not thread safe, so access by multiple threads must be synchronized by an external mechanism such as Collections.synchronizedSet.

Summary

[Expand] Inherited Methods
From class java.util.HashSet boolean add(E object) Adds the specified object to this HashSet. void clear() Removes all elements from this HashSet, leaving it empty. Object clone() Returns a new HashSet with the same elements and size as this HashSet. boolean contains(Object object) Searches this HashSet for the specified object. boolean isEmpty() Returns if this HashSet has no elements, a size of zero. Iterator<E> iterator() Returns an Iterator on the elements of this HashSet. boolean remove(Object object) Removes an occurrence of the specified object from this HashSet. int size() Returns the number of elements in this HashSet.
From class java.util.AbstractSet boolean equals(Object object) Compares the specified object to this Set and answer if they are equal. int hashCode() Returns an integer hash code for the receiver. boolean removeAll(Collection<?> collection) Removes all occurrences in this Collection of each object in the specified Collection.
From class java.util.AbstractCollection boolean add(E object) If the specified element is not contained within this collection, and addition of this element succeeds, then true will be returned. boolean addAll(Collection<? extends E> collection) Adds the objects in the specified Collection to this Collection. void clear() Removes all the elements in this collection. boolean contains(Object object) Searches this Collection for the specified object. boolean containsAll(Collection<?> collection) Searches this Collection for all objects in the specified Collection. boolean isEmpty() Returns true if the collection has no element, otherwise false. abstract Iterator<E> iterator() Returns an Iterator on the elements of this Collection. boolean remove(Object object) Removes the first occurrence of the specified object from this Collection. boolean removeAll(Collection<?> collection) Removes all occurrences in this Collection of each object in the specified Collection. boolean retainAll(Collection<?> collection) Removes all objects from this Collection that are not contained in the specified Collection. abstract int size() Returns the number of elements in this Collection. <T> T[] toArray(T[] contents) Returns an array containing all elements contained in this Collection. Object[] toArray() Returns a new array containing all elements contained in this Collection. String toString() Returns the string representation of this Collection.
From class java.lang.Object Object clone() Returns a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver. boolean equals(Object o) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison. void finalize() Called by the virtual machine when there are no longer any (non-weak) references to the receiver. final Class<? extends Object> getClass() Returns the unique instance of java.lang.Class which represents the class of the receiver. int hashCode() Returns an integer hash code for the receiver. final void notify() Causes one thread which is wait ing on the receiver to be made ready to run. final void notifyAll() Causes all threads which are wait ing on the receiver to be made ready to run. String toString() Returns a string containing a concise, human-readable description of the receiver. final void wait(long time, int frac) Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout. final void wait(long time) Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout. final void wait() Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
From interface java.lang.Iterable abstract Iterator<T> iterator() Returns an Iterator for the elements in this object.
From interface java.util.Collection abstract boolean add(E object) Attempts to add object to the contents of this Collection. abstract boolean addAll(Collection<? extends E> collection) Attempts to add all of the objects contained in collection to the contents of this collection. abstract void clear() Removes all elements from this Collection, leaving it empty. abstract boolean contains(Object object) Searches this Collection for the specified object. abstract boolean containsAll(Collection<?> collection) Searches this Collection for all objects in the specified Collection. abstract boolean equals(Object object) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison. abstract int hashCode() Returns an integer hash code for the receiver. abstract boolean isEmpty() Returns if this Collection has no elements, a size of zero. abstract Iterator<E> iterator() Returns an instance of Iterator that may be used to access the objects contained by this collection. abstract boolean remove(Object object) Removes the first occurrence of the specified object from this Collection. abstract boolean removeAll(Collection<?> collection) Removes all occurrences in this Collection of each object in the specified Collection. abstract boolean retainAll(Collection<?> collection) Removes all objects from this Collection that are not also found in the contents of collection. abstract int size() Returns a count of how many objects are contained by this collection. abstract <T> T[] toArray(T[] array) Returns an array containing all elements contained in this Collection. abstract Object[] toArray() Returns a new array containing all elements contained in this Collection.
From interface java.util.Set abstract boolean add(E object) Adds the specified object to this Set. abstract boolean addAll(Collection<? extends E> collection) Adds the objects in the specified Collection which do not exist in this Set. abstract void clear() Removes all elements from this Set, leaving it empty. abstract boolean contains(Object object) Searches this Set for the specified object. abstract boolean containsAll(Collection<?> collection) Searches this Set for all objects in the specified Collection. abstract boolean equals(Object object) Compares the argument to the receiver, and returns true if they represent the same object using a class specific comparison. abstract int hashCode() Returns an integer hash code for the receiver. abstract boolean isEmpty() Returns if this Set has no elements, a size of zero. abstract Iterator<E> iterator() Returns an Iterator on the elements of this Set. abstract boolean remove(Object object) Removes any occurrence of the specified object from this Set. abstract boolean removeAll(Collection<?> collection) Removes all objects in the specified Collection from this Set. abstract boolean retainAll(Collection<?> collection) Removes all objects from this Set that are not contained in the specified Collection. abstract int size() Returns the number of elements in this Set. abstract <T> T[] toArray(T[] array) Returns an array containing all elements contained in this Set. abstract Object[] toArray() Returns an array containing all elements contained in this Set.