Queue

Class Overview

A kind of collection provides advanced operations than other basic collections, such as insertion, extraction, and inspection. Generally, a queue orders its elements by means of first-in-first-out. While priority queue orders its elements according to a comparator specified or the elements' natural order. Furthermore, a stack orders its elements last-in-first out. A typical queue does not allow null to be inserted as its element, while some implementations such as LinkedList allow it. But null should not be inserted even in these implementations, since method poll return null to indicate that there is no element left in the queue. Queue does not provide blocking queue methods, which will block until the operation of the method is allowed. BlockingQueue interface defines such methods.

Summary

[Expand] Inherited Methods
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.