Java中的 BlockingDeque takeLast() 方法及示例

BlockingDeque的takeLast()方法返回并从中移除 Deque 容器的尾部。如果在等待时被中断，该方法将引发InterruptedException 。

句法：

public E takeLast()

返回：此方法返回 Deque 容器的尾部（最后一个元素） 。

Exception ：如果函数在等待时被中断，则会抛出InterruptedException 。

注意： BlockingDeque的takeLast()方法继承自Java中的 LinkedBlockingDeque 类。

下面的程序说明了 BlockingDeque 的takeLast()方法：

方案一：

Java

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

输出：

Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Head of Blocking Deque: 74381793
Blocking Deque: [7855642, 35658786, 5278367]

方案二：

Java

// Java Program to demonstrate takeLast()
// method of BlockingDeque
 
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
 
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
 
        // create object of BlockingDeque
        BlockingDeque BD
            = new LinkedBlockingDeque();
 
        // Add numbers to end of BlockingDeque
        BD.add(7855642);
        BD.add(35658786);
        BD.add(5278367);
        BD.add(74381793);
 
        // print Deque
        System.out.println("Blocking Deque: " + BD);
 
        BD.clear();
 
        // throws error as the list is empty and it
        // is interrupted while waiting
        System.out.println("Head of Blocking Deque: "
                           + BD.takeLast());
    }
}

运行时错误：

Max real time limit exceeded due to either by heavy load on server or by using sleep function

参考： https: Java/util/concurrent/BlockingDeque.html#takeLast()