Java LinkedBlockingDeque pop() 方法

2025 年 3 月 21 日 | 阅读 2 分钟

LinkedBlockingDeque 类的 pop() 方法会返回此双端队列的第一个元素，并将其移除。pop() 方法返回的结果与 Deque.removeFirst() 返回的结果相似。

语法

参数

不适用

指定者：

LinkedBlockingDeque 类的 pop() 方法在 Deque<E> 接口中由 pop() 方法指定。

返回值

pop() 方法返回此双端队列的最前面的元素。

抛出

如果此双端队列为空，pop() 方法会抛出 NoSuchElementException。

示例 1

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequePopExample1 {
public static void main(String[] args) {
int capacity=100;
LinkedBlockingDeque<String>deque = new LinkedBlockingDeque<String>(capacity);
deque.add("Himanshu");
deque.add("Rahul");
deque.add("Rita");
deque.add("Ramesh");
//retrieves and removes First element of the stack
String val = deque.pop();
System.out.println("First element of the deque is : "+val);
System.out.println("Elements left in deque : "+deque);
    }
}

输出

First element of the dequeis :Himanshu
Elements left in deque : [Rahul, Rita, Ramesh]

示例 2

import java.util.concurrent.LinkedBlockingDeque;
public class LinkedBlockingDequePopExample2 {
public static void main(String[] args) throws InterruptedException {
int capacity = 5;
LinkedBlockingDeque<Integer> queue = new LinkedBlockingDeque<Integer>(capacity);
int val=queue.pop();
System.out.println("Head of queue : "+val);
System.out.println("Elements in queue : "+queue);
    }
}

输出

Exception in thread "main" java.util.NoSuchElementException
	at java.util.concurrent.LinkedBlockingDeque.removeFirst(LinkedBlockingDeque.java:453)
	at java.util.concurrent.LinkedBlockingDeque.pop(LinkedBlockingDeque.java:777)
	at com.javaTpoint.LinkedBlockingDequePopExample2.main(LinkedBlockingDequePopExample2.java:9)

示例 3

import java.util.concurrent.LinkedBlockingDeque;
class Employee1{
private String f_name;
private String l_name;
private String email;
public Employee1(String f_name, String l_name, String email) {
this.f_name= f_name;
this.l_name= l_name;
this.email= email;
    }
public String toString(){
return f_name+"  " +l_name+"  "+email;
    }
}
public class LinkedBlockingDequePopExample3 {
public static void main(String[] args) {
        Employee1 employee1 = new Employee1("Reema     ", "Panda   ", "reemapanda18@gamil.com");
        Employee1 employee2 = new Employee1("Geetanjali", "Sharma  ", "geetanjaliSharma28@gamil.com");
        Employee1 employee3 = new Employee1("Vineet    ", "Tanjea  ", "VineetTanjea56@gamil.com");
        Employee1 employee4 = new Employee1("Himanshu  ", "Bhardwaj", "himanshubhardwaj0604@gamil.com");
int capacity=100;
LinkedBlockingDeque<Employee1>deque = new LinkedBlockingDeque<Employee1>(capacity);
deque.add(employee1);
deque.add(employee2);
deque.add(employee3);
deque.add(employee4);
for (Employee1 xyz : deque) {
System.out.println(deque.pop());
        }
    }
}

输出

Reema       Panda     [email protected]
Geetanjali  Sharma    [email protected]
VineetTanjea    [email protected]
HimanshuBhardwaj  [email protected]

下一个主题Java LinkedBlockingDeque

Java LinkedBlockingDeque pop() 方法

语法

参数

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返回值

抛出

示例 1

示例 2

示例 3

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Java LinkedBlockingDeque pop() 方法

语法

参数

指定者：

返回值

抛出

示例 1

示例 2

示例 3

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