Java 中的 concurrentlinkedequedescendingterator()方法，示例

原文:https://www . geeksforgeeks . org/concurrentlinkeddequee-dependingiterator-method-in-Java-with-example/

Java . util . ConcurrentLinkedDeque .下行迭代器()方法用于返回与 concurrentlinkedrequest 元素相同但顺序相反的迭代器。

语法:

Iterator iterate_value = Array_Deque.descendingIterator();

参数:该方法不取任何参数。

返回值:该方法迭代 deque 的元素，并以相反的顺序返回值(迭代器)。

下面的程序说明了 Java . util . concurrentlinkedeque . DecendingTertor()方法:

程序 1:

// Java code to illustrate descendingIterator()

import java.util.concurrent.*;
import java.util.*;

public class ConcurrentLinkedDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ConcurrentLinkedDeque
        ConcurrentLinkedDeque<String> de_que
            = new ConcurrentLinkedDeque<String>();

        // Use add() method to add elements into the Queue
        de_que.add("Welcome");
        de_que.add("To");
        de_que.add("Geeks");
        de_que.add("4");
        de_que.add("Geeks");

        // Displaying the ConcurrentLinkedDeque
        System.out.println("ConcurrentLinkedDeque: " + de_que);

        // Creating a desc_iterator
        Iterator value = de_que.descendingIterator();

        // Displaying the values after iterating
        // through the ConcurrentLinkedDeque
        // in reverse order
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

Output:

ConcurrentLinkedDeque: [Welcome, To, Geeks, 4, Geeks]
The iterator values are: 
Geeks
4
Geeks
To
Welcome

程序 2:

// Java code to illustrate descendingIterator()

import java.util.*;
import java.util.concurrent.*;

public class ConcurrentLinkedDequeDemo {
    public static void main(String args[])
    {
        // Creating an empty ConcurrentLinkedDeque
        ConcurrentLinkedDeque<Integer> de_que
            = new ConcurrentLinkedDeque<Integer>();

        // Use add() method to add elements into the Queue
        de_que.add(10);
        de_que.add(15);
        de_que.add(30);
        de_que.add(20);
        de_que.add(5);

        // Displaying the ConcurrentLinkedDeque
        System.out.println("ConcurrentLinkedDeque: " + de_que);

        // Creating a desc_iterator
        Iterator value = de_que.descendingIterator();

        // Displaying the values after iterating
        // through the ConcurrentLinkedDeque
        // in reverse order
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

Output:

ConcurrentLinkedDeque: [10, 15, 30, 20, 5]
The iterator values are: 
5
20
30
15
10

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