java 实现多线程的五种方式

1、继承Thread类，实现“T1”线程和主线程交替之行

public class MyTest1 extends Thread{
    @Override
    public void run() {

        for (int i = 0; i <10 ; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("T1");

        }
    }



    public static void main(String[] args) {
        new MyTest1().start();
        for (int i = 0; i <10 ; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("main");
        }


    }
}

2、实现Runable接口

public class MyTest2 implements Runnable{
    @Override
    public void run() {
        for (int i = 0; i <10 ; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("T1");
        }
    }

    public static void main(String[] args) {
        new Thread(new MyTest2()).start();
        for (int i = 0; i <10 ; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("main");
        }
    }
}

3、实现Callable接口

public class MyTest3 implements Callable {
    @Override
    public String call() throws Exception {
        for (int i = 0; i <10 ; i++) {
                try {
                    TimeUnit.MILLISECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("T1");
            }
        return "success";
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {

        Thread t = new Thread(new FutureTask(new MyTest3()));
        t.start();
        
        for (int i = 0; i <10 ; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("main");
        }
    }


}

4、利用lambda表达式

 public static void main(String[] args) throws ExecutionException, InterruptedException {
        new Thread(()->{
            for (int i = 0; i <10 ; i++) {
                try {
                    TimeUnit.MILLISECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("T1");

            }
        }).start();

        for (int i = 0; i <10 ; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("main");
        }
    }

5、利用线程池

 public static void main(String[] args) throws ExecutionException, InterruptedException {
        ExecutorService service = Executors.newCachedThreadPool();
        Future f = service.submit(new MyTest3());
        String s = f.get();
//打印出callable的返回值
        System.out.println(s);
        service.shutdown();
        for (int i = 0; i <10 ; i++) {
            try {
                TimeUnit.MILLISECONDS.sleep(1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println("main");
        }
    }