​新建并启动线程的四种方式

愚见

1. ​Thread类实现了Runnable接口
2. 所有新建方式都与Thread对象有关
3. 所有的线程启动方式都是Thread.start()方法
4. Thread.run()为线程执行的方法，Thread.start()为线程启动的方法；线程启动后会自动调用run();

public class Thread implements Runnable {
   	public Thread() {
   		init(null, null, "Thread-" + nextThreadNum(), 0);
   	}
   	public Thread(Runnable target) {
   		init(null, target, "Thread-" + nextThreadNum(), 0);
   	}
}

1、继承Thread

public class MyThread extends Thread {
    @Override
    public void run() {
        System.out.println("执行中。。。");
    }
    
    @Test
    public void test(){
        MyThread myThread = new MyThread();
        myThread.start();
    }
}

2、实现Runnable接口

public class MyThread implements Runnable {
    @Override
    public void run() {
        System.out.println("执行中。。。");
    }

    @Test
    public void test(){
        MyThread myThread = new MyThread();
        /**
         * Runnable的实现类作为参数，构建thread对象
         */
        Thread thread = new Thread(myThread);
        
        thread.start();
    }
}

3、匿名类实现Runnable

public class MyThread {
    @Test
    public void test(){

        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                System.out.println("执行中。。。");
            }
        });
        
        thread.start();
    }
}

4、lambda表达式

public class MyThread {
    @Test
    public void test(){

        Thread thread = new Thread(()->{
            System.out.println("执行中。。。");
        });
        
        thread.start();
    }
}