线程创建的三种方式

一、继承Thread类

/**
public class Thread
extends Object
implements Runnable
*/
//继承Thread类
public class MyThread extends Thread{
	//重写run()方法
    public void run(){
        for(int i = 1; i<=100; i++){
            System.out.println("i: "+i);
        }
    }
    public static void main(String[] args) {
        MyThread myThread = new MyThread();
        MyThread myThread2 = new MyThread();
		//调用start()方法开启多线程执行
        myThread.start();
        myThread2.start();
    }
}

二、实现Runnable接口

因为Java是单继承，所以推荐使用Runnable接口

//实现Runnable接口
public class MyThread implements Runnable{
	//重写run()方法
    public void run(){
        for(int i = 1; i<=100; i++){
            System.out.println("i: "+i);
        }
    }

    public static void main(String[] args) {
        MyThread myThread = new MyThread();
        MyThread myThread2 = new MyThread();
        //创建线程对象（Thread）调用构造器，将MyThread 对象实例传入并调用start()方法
        new Thread(myThread).start();
        new Thread(myThread2).start();
    }
}

三、实现Callable接口

与使用Runnable相比，Callable功能更加强大

1. 相比run()方法，可以有返回值
2. 方法可以抛出异常
3. 支持泛型的返回值
4. 需要借助FutureTask类，比如获取返回值结果

package com.hui.springcloudyang.thread;

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

public class MyCallable implements Callable<Integer> {

    @Override
    public Integer call() throws Exception {
        synchronized (this) {
            int ticket = 0;
            for (int i = 0; i < 1000; i++) {
                ticket++;
                System.out.println(Thread.currentThread().getName() + "当前票数为：" + ticket);
            }
            return ticket;
        }
    }

    public static void main(String[] args) {
        MyCallable myCallable = new MyCallable();
        FutureTask<Integer> futureTask = new FutureTask(myCallable);
        new Thread(futureTask,"线程1").start();


        try {
            Integer ticket = futureTask.get();
            System.out.println(ticket);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }
}

本文地址：https://blog.csdn.net/weixin_44362355/article/details/110700900