新建双线 程

public class Demo2 {

  public static void main(String[] args) {

    //自定义线程
    new Thread(new Runnable() {
      @Override
      public void run() {
        for (int i = 0; i < 100; i++) {
          System.out.println(Thread.currentThread().getName() + "---"
              + i);
        }
      }

    }).start();

    //main线程
    for (int i = 0; i < 100; i++) {
      System.out.println(Thread.currentThread().getName() + "---" + i);
    }

    //把main线程放在下面不能交替出现
  }

}

和上面都是一样的，都是用接口

class Ticket implements Runnable {
  @Override
  public void run() {
    for (int i = 0; i < 100; i++) {
      System.out.println(Thread.currentThread().getName() + i);

    }

  }

}

public class Demo3 {
  public static void main(String[] args) {
    Ticket ticket = new Ticket();
    Thread thread = new Thread(ticket, "自定义线程");
    thread.start();

    for (int i = 0; i < 100; i++) {
      System.out.println(Thread.currentThread().getName() + i);
    }

  }
}