Java中的 LinkedBlockingDeque removeLast() 方法

LinkedBlockingDeque的removeLast()方法返回并移除 Deque 容器尾部的元素。如果 Deque 容器为空，该方法将引发NoSuchElementException 。

句法：

public E removeLast()

参数：此方法不接受任何参数。

返回：此方法返回 Deque 容器的尾部。

异常：如果双端队列为空，该函数将抛出NoSuchElementException 。

下面的程序说明了 LinkedBlockingDeque 的removeLast()方法：

方案一：

// Java Program to demonstrate removeLast()
// method of LinkedBlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque LBD
            = new LinkedBlockingDeque();
  
        // Add numbers to end of LinkedBlockingDeque
        LBD.add(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);
  
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // removes the last element and prints it
        System.out.println("Linked Blocking Deque: " +      
                        LBD.removeLast());
  
        // prints the Deque
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

输出：

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

方案二：

// Java Program to demonstrate removeLast()
// method of LinkedBlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws NoSuchElementException
    {
  
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque LBD
            = new LinkedBlockingDeque();
  
        // Add numbers to end of LinkedBlockingDeque
        LBD.add(7855642);
        LBD.add(35658786);
        LBD.add(5278367);
        LBD.add(74381793);
  
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
  
        // Deque is empty
        LBD.clear();
  
        // throws an exception
        LBD.removeLast();
    }
}

输出：

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: Java/util/concurrent/LinkedBlockingDeque.html#removeLast–