LinkedBlockingDeque的takeFirst()方法返回并从中删除Deque容器的第一个元素,如有必要,请等待直到某个元素可用为止。如果该方法在等待期间被中断,则该方法将引发InterruptedException。
用法:
public E takeFirst()
返回值:此方法返回Deque容器的第一个元素,如有必要,请等待直到元素可用。
异常:如果函数在等待期间被中断,则该函数将引发InterruptedException。
以下示例程序旨在说明LinkedBlockingDeque的takeFirst()方法:
示例1:
// Java Program to demonstrate takeFirst()
// 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<Integer> LBD
= new LinkedBlockingDeque<Integer>();
// 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 front element and prints it
System.out.println("Head of Linked Blocking Deque: "
+ LBD.takeFirst());
// prints the Deque
System.out.println("Linked Blocking Deque: " + LBD);
}
}
输出:
Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793] Head of Linked Blocking Deque: 7855642 Linked Blocking Deque: [35658786, 5278367, 74381793]
示例2:演示InterruptedException
// Java Program to demonstrate takeFirst()
// 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<Integer> LBD
= new LinkedBlockingDeque<Integer>();
// 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);
LBD.clear();
// throws error as the list is empty and it
// is interrupted while waiting
System.out.println("Head of Linked Blocking Deque: "
+ LBD.takeFirst());
}
}
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://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#takeFirst–
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注:本文由纯净天空筛选整理自gopaldave大神的英文原创作品 LinkedBlockingDeque takeFirst() method in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。