创建线程的四种方式

参考资料：
https://www.cnblogs.com/songshu120/p/7966314.html

1）继承Thread类

public class Thread01 {
    public static void main(String[] args) {
        Thread thread = new Thread() {
            @Override
            public void run() {
                System.out.println("thread start!");
            }
        };
        thread.start();
    }
}

public class Test01 {
    
    public static void main(String[] args) {
        
        //创建线程对象
        MyThread t = new MyThread();
        
        //启动线程
        t.start();
    }
}

//线程类
class MyThread extends Thread{
    //线程对象调到CPU资源后，运行run方法
    @Override
    public void run() {
        for (int i = 1; i <= 10; i++) {
            System.out.println(i);
        }
    }
}

2）实现Runnable接口

public class Test01 {

    public static void main(String[] args) {
        
        //创建线程，并给任务
        Thread t = new Thread(new Task());
        //启动线程
        t.start();
        
    }
}
//任务类
class Task implements Runnable{
    @Override
    public void run() {
        for (int i = 1; i <= 10; i++) {
            System.out.println(i);
        }
    }
}

3）实现Callable接口，这种是有返回值的线程

public class Test01 {
    
    public static void main(String[] args) throws Exception {
        
        //将带返回值的任务类装载在FutureTask对象中
        FutureTask<String> futureTask = new FutureTask<>(new Task());
        
        Thread t = new Thread(futureTask);
        t.start();
        
        //获取返回值
        String str = futureTask.get();
        System.out.println(str);
        
    }
}
//带返回值的任务类
class Task implements Callable<String>{

    //类似于Runnable接口中的run方法，线程抢到资源就会执行call方法
    @Override
    public String call() throws Exception {
        for (int i = 1; i <= 10; i++) {
            System.out.println(i);
        }
        return "带返回值的任务类";
    }
    
}