Java BlockingDeque takeLast()方法及示例

BlockingDeque 的 takeLast() 方法返回并删除Deque容器的尾部。如果该方法在等待时被中断，则抛出一个 InterruptedException 。

语法

public E takeLast()

返回： 该方法返回Deque容器的 尾部（最后一个元素） 。

异常 ：如果在等待过程中被打断，该函数会抛出一个InterruptedException。

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

以下程序说明了BlockingDeque的takeLast()方法。

程序1 :

// 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<Integer> BD
            = new LinkedBlockingDeque<Integer>();
 
        // 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]

程序2

// 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<Integer> BD
            = new LinkedBlockingDeque<Integer>();
 
        // 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

**参考资料: **https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#takeLast()