关于继承的问题

Question

package  mypack;  
import  java.awt.*;  
import  javax.swing.*;  
import  java.util.Date;  
public  class  Clock  extends  JFrame    
{            private  Date  d=new  Date();  
           private  Container  con;  
           private  JLabel  jtime=null;  
           class  Ctime  extends  Thread  
           {  
                       public  void  run(){  
                       try{jtime  =new  JLabel("1");  
                       con.setLayout(new  BorderLayout());              
                       Thread.sleep(1000);                          
                       }catch(Exception  e){}  
 
           }  
           }            Clock()  
           {                          
                         
                       con=this.getContentPane();  
                       this.setSize(200,100);  
                       this.setVisible(true);              
           }  
           public  static  void  main(String[]  str)  
             {    
               new  Clock();  
}  
}  
 
这是我写的，但运行后怎么什么都不显示啊，我原意是要做个窗口把当前的时间显示出来。。但现在是空的，应该怎么写啊，我是刚学的菜鸟,请各位大大多多指教啊

Answer 1

//package  mypack;  
import  java.awt.*;  
import  javax.swing.*;  
import  java.util.Date;  
public  class  Clock  extends  JFrame    
{            
         private  Date  d=new  Date();  
           private  Container  con;  
           private  JLabel  jtime=null; 
           private  Ctime   go; 
           class  Ctime  extends  Thread  
           {  
                public  void  run(){  
                       try{
                        while(true){
                        jtime.setText(Integer.toString(Integer.parseInt(jtime.getText())+1));
                      con.setLayout(new  BorderLayout());  
                       System.out.println("1");//这个是用来看线程有没执行的          
                        Thread.sleep(1000);
                        }
                                                  
                       }catch(Exception  e){}  
 
            }             }
           Clock()  
           {                          
                         
                       con=this.getContentPane(); 
                       jtime  =new  JLabel("0"); 
                       con.add(jtime);
                       this.setSize(200,100);  
                       this.setVisible(true);   
                       go = new Ctime();    
                            
           }  
           public  static  void  main(String[]  str)  
             {    
              Clock ob = new  Clock();  
              Clock.Ctime ob2 =ob.new Ctime();//用了一个内部类的调用
         ob2.start();
}  
}  我把它改了一下，你看这样可以不？？
加油！！