Java LinkedBlockingDeque descendingIterator()用法及代码示例

LinkedBlockingDeque的descendingIterator()方法以相反的顺序在此双端队列中的元素上返回迭代器。元素将按从last(tail)到first(head)的顺序返回。返回的迭代器是一个弱一致性迭代器。

用法:

public Iterator descendingIterator()

参数：此方法不接受任何参数。

返回值：此方法以相反的顺序在此双端队列中的元素上返回迭代器。

以下示例程序旨在说明LinkedBlockingDeque的descendingIterator()方法：

程序1:

// Java Program Demonstrate descendingIterator() 
// method of LinkedBlockingDeque 
  
import java.util.concurrent.LinkedBlockingDeque; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
  
    { 
  
        // create object of LinkedBlockingDeque 
        LinkedBlockingDeque<Integer> LBD 
            = new LinkedBlockingDeque<Integer>(); 
  
        // Add numbers to front of LinkedBlockingDeque 
        LBD.addFirst(7855642); 
        LBD.addFirst(35658786); 
        LBD.addFirst(5278367); 
        LBD.addFirst(74381793); 
  
        // Call descendingIterator() method of LinkedBlockingDeque 
        Iterator iteratorVals = LBD.descendingIterator(); 
  
        // Print elements of iterator 
        // created from PriorityBlockingQueue 
        System.out.println("The iterator values"
                           + " of LinkedBlockingDeque are:"); 
  
        // prints the elements using an iterator 
        while (iteratorVals.hasNext()) { 
            System.out.println(iteratorVals.next()); 
        } 
    } 
}

输出：

The iterator values of LinkedBlockingDeque are:
7855642
35658786
5278367
74381793

程序2:

// Java Program Demonstrate descendingIterator() 
// method of LinkedBlockingDeque 
// when list is of strings 
  
import java.util.concurrent.LinkedBlockingDeque; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
  
    { 
  
        // create object of LinkedBlockingDeque 
        LinkedBlockingDeque<String> LBD 
            = new LinkedBlockingDeque<String>(); 
  
        // Add numbers to front of LinkedBlockingDeque 
        LBD.add("Geeks"); 
        LBD.add("forGeeks"); 
        LBD.add("A"); 
        LBD.add("Computer"); 
        LBD.add("Portal"); 
  
        // Call iterator() method of LinkedBlockingDeque 
        Iterator iteratorVals = LBD.descendingIterator(); 
  
        // Print elements of iterator 
        // created from PriorityBlockingQueue 
        System.out.println("The iterator values"
                           + " of LinkedBlockingDeque are:"); 
  
        // prints the elements using an iterator 
        while (iteratorVals.hasNext()) { 
            System.out.println(iteratorVals.next()); 
        } 
    } 
}

输出：

The iterator values of LinkedBlockingDeque are:
Portal
Computer
A
forGeeks
Geeks

参考： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#descendingIterator()

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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 LinkedBlockingDeque descendingIterator() method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。