Java开启线程的四种方法案例详解

java开启线程 java开启线程四种方法 java开启线程方式 2023-02-16 12:02:52 153人浏览独家记忆

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摘要

目录1、继承Thread类1.1 代码实现1.2 测试结果2、实现Runnable接口2.1 方式一：直接实现Runnable接口2.1.1 代码实现2.1.2 测试结果2.2 方式

1、继承Thread类

1.1 代码实现

package com.zyz.mynative.demo03;


public class ExtendThread extends Thread {

    public static void main(String[] args) {
        ExtendThread thread = new ExtendThread();
        thread.start();
    }

    
    @Override
    public void run() {
        doSomething();
    }

    
    public void doSomething() {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "执行" + i);
        }
    }
}

1.2 测试结果

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2、实现Runnable接口

2.1 方式一：直接实现Runnable接口

避免单继承的局限性,方便共享资源,推荐使用

2.1.1 代码实现

package com.zyz.mynative.demo03;


public class RunnableImpl implements Runnable {


    public static void main(String[] args) {
        RunnableImpl runnable = new RunnableImpl();
        Thread thread = new Thread(runnable);
        thread.start();

        

    }

    
    @Override
    public void run() {
        doSomething();
    }

    
    private void doSomething(){
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "执行" + i);
        }
    }
}

2.1.2 测试结果

在这里插入图片描述

2.2 方式二：匿名内部类

2.2.1 代码实现

package com.zyz.mynative.demo03;


public class RunnableImpl2 {


    public static void main(String[] args) {
        RunnableImpl2 test = new RunnableImpl2();
        test.myRun();
    }

    public void myRun(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                doSomething();
            }
        }).start();
    }

    
    private void doSomething(){
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "执行" + i);
        }
    }
}

2.2.2 测试结果

在这里插入图片描述

3、实现Callable接口

3.1 代码实现

package com.zyz.mynative.demo03;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;


public class CallableImpl implements Callable<String> {

    public static void main(String[] args) {
        Callable<String> tc = new CallableImpl();
        FutureTask<String> task = new FutureTask<>(tc);
        new Thread(task).start();
        try {
            System.out.println(task.get());
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }

    private int ticket = 5;

    @Override
    public String call() throws Exception {
        for (int i = 0; i < 10; i++) {
            System.out.println(doSomething());
        }

        return "出票任务完成";
    }

    public String doSomething() {
        String result = "";
        if (this.ticket > 0) {
            result = "出票成功，ticket=" + this.ticket--;
        } else {
            result = "出票失败，ticket=" + this.ticket;
        }
        return result;
    }
}

3.2 测试结果

在这里插入图片描述

4、创建线程池

4.1 代码实例

package com.zyz.mynative.demo03;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class ThreadPool implements Runnable {
    public static void main(String[] args) {
      ExecutorService pool = Executors.newFixedThreadPool(2);
      ThreadPool threadPool = new ThreadPool("AA");
      ThreadPool threadPoo2 = new ThreadPool("BB");
      pool.execute(threadPool);
      pool.execute(threadPoo2);
      pool.shutdown();
    }

    String name;
    public ThreadPool(String name) {
        this.name = name;
    }

    @Override
    public void run() {
        doSomething();
    }

    
    private void doSomething() {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "执行" + i + "，name=" + this.name);
        }
    }
}