【线程】启动线程的三种方式

1.继承Thread

public class Thread01 extends Thread {

    @Override
    public void run() {
        System.out.println("thread01");
    }

}

class TestThread01 {
    public static void main(String[] args) {
        Thread01 thread01 = new Thread01();
        thread01.start();;
    }
}

2.实现Runnable接口

public class Thread02 implements Runnable {
    @Override
    public void run() {
        System.out.println("实现Runnable接口");
    }
}

class TestThread02 {
    public static void main(String[] args) {
        Thread thread = new Thread(new Thread02());
        thread.start();
    }
}

3.实现Callable接口

public class Thread03 implements Callable<Integer> {
    @Override
    public Integer call() throws Exception {
        int i;
        for (i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName());
        }
        return i;
    }
}

class TestThread03 {
    public static void main(String[] args) {
        Thread03 thread03 = new Thread03();
        FutureTask<Integer> futureTask = new FutureTask<Integer>(thread03);
        Thread thread = new Thread(futureTask);
        thread.start();

        try {
            System.out.println(futureTask.get());
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }
}