Java线程开启的三种方式

第一种 继承Thread

public class ThreadDemo extends Thread{
          
   
    @Override
    public void run() {
          
   
        System.out.println("开启线程");
    }
}

public class test {
          
   
    public static void main(String[] args) {
          
   
        ThreadDemo td = new ThreadDemo();
        td.start();

    }
}

第二种 通过Runnable接口

//实现Runnable接口
public class MyThread implements Runnable{
          
   
    @Override
    public void run() {
          
   
        for (int i = 0; i < 100; i++) {
          
   
            System.out.println(Thread.currentThread().getName() + "开启" + i);
        }
    }
}

public class test {
          
   
    public static void main(String[] args) {
          
   
        MyThread mt = new MyThread();
        Thread thread = new Thread(mt);
        thread.setName("一条线程");
        thread.start();
    }
}

第三种 实现Callable接口

public class callableDemo implements Callable<String> {
          
   

    @Override
    public String call() throws Exception {
          
   
        for (int i = 0; i < 100; i++) {
          
   
            System.out.println("你爱我吗?");
        }
        return "我爱你";
    }
}

public class test {
          
   
    public static void main(String[] args) throws ExecutionException, InterruptedException {
          
   
        callableDemo cd = new callableDemo();
        FutureTask<String> sf = new FutureTask<String>(cd);
        Thread thread = new Thread(sf);
        thread.start();
        String s = sf.get();  //线程结束后，获取返回结果
        System.out.println(s);
    }
}