Java BlockingDeque take()方法及示例

BlockingDeque 的 take() 方法返回并删除Deque容器的头部。如果该方法在等待过程中被打断，则抛出一个InterruptedException。

语法

public E take()

返回： 该方法返回Deque容器的头部。

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 take() 方法是从Java的LinkedBlockingDeque类中继承的。

以下程序说明了BlockingDeque的take()方法。

程序1 :

// Java Program to demonstrate take()
// method of LinkedBlockingDeque
  
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 front element and prints it
        System.out.println("Head of Blocking Deque: "
                           + BD.take());
  
        // prints the Deque
        System.out.println("Blocking Deque: " + BD);
    }
}

输出:

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

程序2： 演示InterruptedException

// Java Program to demonstrate take()
// 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>();
  
        // print Dequeue
        // the Deque is empty
        System.out.println("Blocking Deque: " + BD);
  
        try {
            // throws error as the list is empty
            // and it is interrupted while waiting
            System.out.println("Head of Blocking Deque: "
                               + BD.take());
        }
        catch (Exception e) {
            System.out.println("Exception: " + e);
        }
    }
}

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#take()