Java.util.ArrayDeque.descendingIterator() Java.util.ArrayDeque.contains(Object) Java.util.ArrayDeque.element() 描述 所述java.util.ArrayDeque.descendingIterator()方法返回一个迭代器可在此元素双端队列以逆向顺序。 声明 以下是java.util.ArrayDeque.descendingIterator()方法的声明 public Iterator<E> descendingIterator() 参数 NA 返回值 此方法以相反的顺序返回此双端队列中元素的迭代器。 异常 NA 实例 以下示例显示了java.util.ArrayDeque.descendingIterator()方法的用法。 package com.tutorialspoint; import java.util.ArrayDeque; import java.util.Deque; import java.util.Iterator; public class ArrayDequeDemo { public static void main(String[] args) { // create an empty array deque with an initial capacity Deque<Integer> deque = new ArrayDeque<Integer>(8); // use add() method to add elements in the deque deque.add(15); deque.add(22); deque.add(25); deque.add(20); //iterator() is used to print all the elements //next() returns the next element on each iteration System.out.println("printing elements using iterator:"); for(Iterator itr = deque.iterator();itr.hasNext();) { System.out.println(itr.next()); } //descendingIterator() is used to print the elements in reverse order //next() returns the next element on each iteration System.out.println("printing elements in reverse order:"); for(Iterator descItr = deque.descendingIterator();descItr.hasNext();) { System.out.println(descItr.next()); } } } 让我们编译并运行上面的程序,这将产生以下结果 printing elements using iterator: 15 22 25 20 printing elements in reverse order: 20 25 22 15 Java.util.ArrayDeque.contains(Object) Java.util.ArrayDeque.element()