Java中的LinkedBlockingDeque removeLast()方法

LinkedBlockingDeque 的 removeLast() 方法返回并删除Deque容器的尾部元素。如果Deque容器为空，则该方法会抛出NoSuchElementException异常。

语法:

public E removeLast()

参数: 该方法不接受任何参数。

返回值: 该方法返回Deque容器的尾部。

异常: 如果Deque为空，则该方法会抛出NoSuchElementException异常。

下面的程序演示了LinkedBlockingDeque的removeLast()方法：

程序 1:

//Java程序演示LinkedBlockingDeque的removeLast()方法
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // 创建LinkedBlockingDeque对象
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
  
        // 在LinkedBlockingDeque的末尾添加数字
        LBD.add(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);
  
        // 打印Deque
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // 删除最后一个元素并打印它
        System.out.println("Linked Blocking Deque: " +      
                        LBD.removeLast());
  
        // 打印Deque
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Linked Blocking Deque: 74381793
Linked Blocking Deque: [7855642, 35658786, 5278367]

程序 2:

//Java程序演示LinkedBlockingDeque的removeLast()方法
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws NoSuchElementException
    {
  
        // 创建LinkedBlockingDeque对象
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
  
        // 在LinkedBlockingDeque末尾添加数字
        LBD.add(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);
  
        // 打印Deque
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // Deque为空
        LBD.clear();
  
        // 抛出异常
        LBD.removeLast();
    }
}

输出结果:

Exception in thread "main" java.util.NoSuchElementException
    at java.util.concurrent.LinkedBlockingDeque.removeLast(LinkedBlockingDeque.java:462)
    at GFG.main(GFG.java:29)

参考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#removeLast–