多线程的创建方式有哪些？

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1、「继承Thread类」，重写run()方法

public class Demo extends Thread{
    //重写父类Thread的run()
    public void run() {
    }
    public static void main(String[] args) {
        Demo d1 = new Demo();
        Demo d2 = new Demo();
        d1.start();
        d2.start();
    }
}

2.「实现Runnable接口」，重写run()

public class Demo2 implements Runnable{

    //重写Runnable接口的run()
    public void run() {
    }

    public static void main(String[] args) {
        Thread t1 = new Thread(new Demo2());
        Thread t2 = new Thread(new Demo2());
        t1.start();
        t2.start();
    }

}

3.「实现 Callable 接口」

public class Demo implements Callable<String>{

    public String call() throws Exception {
        System.out.println("正在执行新建线程任务");
        Thread.sleep(2000);
        return "结果";
    }

    public static void main(String[] args) throws InterruptedException, ExecutionException {
        Demo d = new Demo();
        FutureTask<String> task = new FutureTask<>(d);
        Thread t = new Thread(task);
        t.start();
        //获取任务执行后返回的结果
        String result = task.get();
    }

}

4.「使用线程池创建」

public class Demo {
    public static void main(String[] args) {
        Executor threadPool = Executors.newFixedThreadPool(5);
        for(int i = 0 ;i < 10 ; i++) {
            threadPool.execute(new Runnable() {
                public void run() {
                    //todo
                }
            });
        }

    }
}