Java-开启一个新的线程

public class DoSomething implements Runnable { //实现Runnable接口
    public void run() {                                  // 实现run方法
        for (int i = 0; i < 5; i++) {         // 重复5次
            System.out.println("次线程do something");
            try {
                Thread.sleep(1000);  //休眠1秒
            } catch (Exception e) {}
        }
    }

    public static void main(String[] args) {
        DoSomething dothing = new DoSomething();
        Thread t1 = new Thread(dothing);
        t1.start();                                                 //这里就是楼主提的问题，启动线程，执行上面写的run()方法
        for (int i = 0; i < 5; i++) {                          //主线程             
            System.out.println("主线程do something");
            try {
                                 Thread.sleep(1000);     //休眠1秒
            } catch (Exception e) {}
        }
    }
}

　　Thread t1 = new Thread(new Runnable(){
                public void run() {
                    System.out.println("start data run......");
                    System.out.println("stop data run......");
                }
        });
        t1.start();