Java BlockingDeque take()用法及代碼示例

BlockingDeque的take()方法返回並從中刪除Deque容器的頭部。如果該方法在等待時被中斷，則拋出InterruptedException。

用法:

public E take()

返回值：此方法返回雙端隊列容器的頭部。

異常：如果函數在等待期間被中斷，則該函數將引發InterruptedException。

注意：BlockingDeque的take()方法已從Java中的LinkedBlockingDeque類繼承。

以下示例程序旨在說明BlockingDeque的take()方法：

示例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); 
    } 
}

輸出：

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

示例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); 
        } 
    } 
}

運行時錯誤：

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

參考： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#take()

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注：本文由純淨天空篩選整理自gopaldave大神的英文原創作品 BlockingDeque take() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。