线程的三种实现方法

public class  extends Thread {
    int i = 0;
    
    public void run() {
        super.run();
        for (; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "   " + i);
        }
    }
    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "   " + i);
        }
        
        new OneThread().start();
        //主线程中
        new OneThread().run();
    }
}

public class TwoThread implements Runnable {
    int i = 0;
    
    public void run() {
        for (; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "   " + i);
        }
    }
    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "   " + i);
        }
        TwoThread twoThread = new TwoThread();
        new Thread(twoThread,"thread-a").start();
        TwoThread twoThread1 = new TwoThread();
        new Thread(twoThread1,"thread-b").start();
    }
}

public class ThreeThread implements Callable<Integer> {
    
    public Integer call() throws Exception {
        int i = 0;
        for (; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "   " + i);
        }
        return i;
    }
    public static void main(String[] args) {
        ThreeThread threeThread = new ThreeThread();
        FutureTask<Integer> futureTask = new FutureTask<Integer>(threeThread);
        for (int i = 0; i < 10; i++) {
            System.out.println(Thread.currentThread().getName() + "   " + i);
        }
        new Thread(futureTask, "返回值的线程").start();
        try {
            System.out.println("线程返回值: " + futureTask.get());
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
    }
}