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 {@Overridepublic 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 {@Overridepublic 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> {@Overridepublic 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);}
}