java线程三种方式

1.继承Thread类 线程1.2交替执行

public class MyThread extends Thread {
    @Override
    public void run() {
        for (int i = 0; i < 100; ++i) {
            System.out.println(getName()+"------"+"HelloWorld");
        }
    }
}

/**
 * @desc 继承Thread类，线程1 2 交替执行
 * @date 2023-11-05 9:22
 */
public class Demo {
    public static void main(String[] args) {
        MyThread myThread1=new MyThread();
        myThread1.setName("线程1");
        myThread1.start();
        
        MyThread myThread2=new MyThread();
        myThread2.setName("线程2");
        myThread2.start();
    }
}

2.实现Runnable接口  线程1.2交替执行

public class Mythread implements Runnable {

    @Override
    public void run() {
        for (int i = 0; i < 100; ++i) {

            String name = Thread.currentThread().getName();
            System.out.println("你好世界！"+"----"+name);
        }
    }
}

public class Demo {
    public static void main(String[] args) {
        Mythread mythread=new Mythread();

        Thread t1=new Thread(mythread);
        t1.setName("线程1");
        Thread t2=new Thread(mythread);
        t2.setName("线程2");

        t1.start();
        t2.start();
    }
}

3.实现Callable接口 ，这种实现方式可以接收线程的返回值

public class MyCallable implements Callable<Integer> {
    @Override
    public Integer call() {
        int result = 0;
        for (int i = 0; i < 100; i++) {
            result += i;
        }
        return result;
    }
}

public class Demo {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        MyCallable myCallable = new MyCallable();
        //创建FutureTask 管理多线程运行结果 Integer 返回值的泛型
        FutureTask<Integer> futureTask = new FutureTask<>(myCallable);
        //创建线程的对象
        Thread thread = new Thread(futureTask);
        //启动线程
        thread.start();
        Integer result=futureTask.get();
        System.out.println(result);
    }
}