java多线程执行问题

class Demo extends Thread{
    public Demo(String name){
        super(name);
    }
      
    public void run(){
        for(int i=0; i<6; ++i){
            System.out.println("i = " + i + "......Thread=" + Thread.currentThread().getName());
            try{
                Thread.sleep(100);
            }catch(InterruptedException e){
                System.out.println("进程被打断！");
            }
        }
    }
}
 
 
public class Test{
   public static void main(String[] args) throws InterruptedException{
          
        Demo d1 = new Demo("hjz");
        Demo d2 = new Demo("chb");
        d1.start();
        //另外当某一个线程因为异常而终止，其他的线程照样执行，不会受到任何影响！
        System.out.println(5/0);//throw new ArithmeticException()
        for(int i=0; i<6; ++i){
            System.out.println("i = " + i + "......Thread=" + Thread.currentThread().getName());
            Thread.sleep(200);
        }
         
         
        d2.start();//如果开启新线程之前，就因为异常而中止了线程，那么新线程将无法开启！
   }
}
  
/* 
 class Demo extends Thread{
    public Demo(String name){
        super(name);
    }
    //public Thread(String name) {
    //    init(null, null, name, 0);
    //} 也就是在创建线程对象的时候，通过构造函数该线程就有了名字了！
    public void run(){
        for(int i=0; i<6; ++i){
            System.out.println("i = " + i + "......Thread=" + getName());
            try{
                Thread.sleep(100);
            }catch(InterruptedException e){
                System.out.println("进程被打断！");
            }
        }
    }
}
 
public class Test{
   public static void main(String[] args) throws InterruptedException{
        Demo d1 = new Demo("hjz");
        Demo d2 = new Demo("chb");
         
        d1.run();
        d2.run();  
   }
}
 */