Java 开启多线程常见的4种方法

public class RunnableDemo implements Runnable {

    @Override
    public void run() {
            System.out.println(Thread.currentThread().getName() + "执行了");
    }
    
   /**
     * 使用 Runnable 实例再创建一个 Thread 实例，然后调用 Thread 实例的 start() 方法来启动线程。
     */
    public static void main(String[] args) {
        RunnableDemo runnable = new RunnableDemo();
        Thread thread0 = new Thread(runnable);
        Thread thread1 = new Thread(runnable);
        thread0.start();
        thread1.start();

    }
}

public class CallableDemo implements Callable<String> {

    @Override
    public String call() {
        System.out.println(Thread.currentThread().getName() + "执行了");
        return "执行成功!";
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        CallableDemo mc = new CallableDemo();
        FutureTask<String> ft0 = new FutureTask<>(mc);
        FutureTask<String> ft1 = new FutureTask<>(mc);
        Thread thread0 = new Thread(ft0);
        Thread thread1 = new Thread(ft1);
        thread0.start();
        thread1.start();
        System.out.println(ft0.get());
        System.out.println(ft1.get());
    }
}

public class ThreadDemo extends Thread {

    @Override
    public void run() {
        System.out.println(Thread.currentThread().getName() + "执行了");
    }

    public static void main(String[] args) {
        ThreadDemo thread0 = new ThreadDemo();
        ThreadDemo thread1 = new ThreadDemo();
        thread0.start();
        thread1.start();
    }
}

public class ThreadTest {

    public static void start() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println(Thread.currentThread().getName() + "执行了");
            }
        }).start();
    }

    public static void main(String[] args) {
        start();
        start();
    }
}