Java 中的 linkedblockingrequeremovefirst()方法
原文:https://www . geeksforgeeks . org/link edblockingeque-remove first-method-in-Java/
的 removeFirst() 方法链接锁定请求返回并从中移除德奎容器的第一个元素。如果德奎容器是空的，该方法抛出一个 NoSuchElementException 。
语法:
public E removeFirst()
返回:该方法返回德清容器的头，这是第一个元素。
异常:如果德格为空，该函数抛出 NoSuchElementException 。
下面的程序说明了 link edblockingrequest 的 removeFirst()方法:
程序 1:
// Java Program to demonstrate removeFirst()
// 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 Dequee
System.out.println("Linked Blocking Deque: " + LBD);
// removes the front element and prints it
System.out.println("First element of Linked Blocking Deque: "
+ LBD.removeFirst());
// prints the Deque
System.out.println("Linked Blocking Deque: " + LBD);
}
}
输出:
Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
First element of Linked Blocking Deque: 7855642
Linked Blocking Deque: [35658786, 5278367, 74381793]
程序二:
// Java Program to demonstrate removeFirst()
// method of LinkedBlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws NoSuchElementException
{
// create object of LinkedBlockingDeque
LinkedBlockingDeque<Integer> LBD
= new LinkedBlockingDeque<Integer>();
// print Dequee
System.out.println("Linked Blocking Deque: " + LBD);
try {
// throws an exception
LBD.removeFirst();
}
catch (Exception e) {
System.out.println("Exception when removing "
+ "first element from this Deque: "
+ e);
}
}
}
输出:
Linked Blocking Deque: []
Exception when removing first element from this Deque: java.util.NoSuchElementException
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