1. WIKI教程
2. Java.util包
3. Iterator<E> descendingIterator()

Iterator<E> descendingIterator()

描述 (Description)

java.util.ArrayDeque.descendingIterator()方法以反向顺序的顺序返回此deque中元素的iterator 。

声明 (Declaration)

以下是java.util.ArrayDeque.descendingIterator()方法的声明

public Iterator<E> descendingIterator()

参数 (Parameters)

NA

返回值 (Return Value)

此方法以reverse顺序返回此双端队列中元素的迭代器。

异常 (Exception)

NA

例子 (Example)

以下示例显示了java.util.ArrayDeque.descendingIterator（）方法的用法。

package com.iowiki;
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