启动线程

start()与run()的比较

public class StartAndRunMethod {

    public static void main(String[] args) {
        Runnable runnable = () ->{
            System.out.println(Thread.currentThread().getName());
        };
        runnable.run(); //main

        new Thread(runnable).start(); //Thread-2
    }
}

start() 解读

不能重复start()

public class CantStartTwice {
    public static void main(String[] args) {
        Thread thread = new Thread();
        thread.start();
        thread.start();
    }
}

源码解析：

1. 启动新线程检查线程状态
   

2. 加入线程组

3. 调用start0()

Run()解读