Java 中 BlockingDeque takeFirst()方法，带示例
原文:https://www . geeksforgeeks . org/blocking reque-take first-in-method-in-Java-with-examples/
阻塞请求的 takeFirst() 方法返回并从中移除德奎容器的第一个元素，如有必要，等待直到某个元素可用..如果在等待时被中断，该方法将抛出中断异常。
语法:
public E takeFirst()
返回:该方法返回德格容器的第一个元素，如有必要，等待直到某个元素可用。
异常:如果在等待时被中断，该功能会抛出中断异常。
注:blocking request的 takeFirst() 方法继承自 Java 中的 LinkedBlockingDeque 类。
下面的程序说明了 link edblockingrequest 的 takeFirst()方法:
程序 1:
// Java Program to demonstrate takeFirst()
// method of BlockingDeque
import java.util.concurrent.BlockingDeque;
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.takeFirst());
// prints the Deque
System.out.println("Blocking Deque: " + BD);
}
}
输出:
Blocking Deque: [7855642, 35658786, 5278367, 74381793]
Head of Linked Deque: 7855642
Blocking Deque: [35658786, 5278367, 74381793]
程序 2: 演示中断异常
// Java Program to demonstrate takeFirst()
// 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 Dequeue
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.takeFirst());
}
}
运行时错误:
Max real time limit exceeded due to either by heavy load on server or by using sleep function
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