多线程的实现方式

继承Thread，重写run方法

public class Demo extends Thread{

    @Override
    public void run() {

        /* 线程代码 */
        System.out.println("123 " + Thread.currentThread().getName());

    }

    public static void main(String[] args) {

        Demo demo1 = new Demo();
        demo1.start();

        Demo demo2 = new Demo();
        demo2.start();

    }
}

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实现Runnable接口

public class Demo implements Runnable{

    public static void main(String[] args) {

        Thread t1 = new Thread(new Demo());
        t1.start();

        Thread t2 = new Thread(new Demo());
        t2.start();

    }

    @Override
    public void run() {

        System.out.println("123 " + Thread.currentThread().getName());

    }
}

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使用Callable和FutureTask

public class Demo{

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

        Callable callable = new Callable() {
            @Override
            public Object call() throws Exception {

                System.out.println("123 " + Thread.currentThread().getName());
                return null;
            }
        };

        FutureTask task1 = new FutureTask(callable);
        FutureTask task2 = new FutureTask(callable);

        task1.run();
        task2.run();

    }
}

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