多线程基础一之（线程的3种实现方式）

实现线程的三种方式：

   （1）继承Thread类，重写Run方法　

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

(2)实现Runnable接口,重写Run方法

class RunnableThread implements Runnable{

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

(3)实现callable接口，重写call（）方法，并带返回值

public class CallableDemo implements Callable<String> {

    public static void main(String[] args) throws Exception{

        ExecutorService executorService = Executors.newCachedThreadPool();
        CallableDemo callableDemo = new CallableDemo();
        Future<String> future = executorService.submit(callableDemo);
        //call未执行完
        //放一些其他业务逻辑的处理
        System.out.println(future.get());//阻塞
        executorService.shutdown();
    }
    @Override
    public String call() throws Exception {
        return "String"+1;
    }
}