thissuper.java

主要介绍了JAVA的基本知识和异常处理的知识

import java.applet.Applet;
import java.awt.*;
import java.util.*;

public class thissuper extends Applet
{
  thisthis t1 ;ssuper s1;
  public void init()
  {    
   t1 =new thisthis(); 
   s1=new ssuper();
  }
  public void paint(Graphics g)
  {           
    g.drawString("20的绝对值+b(1)是      " + t1.ab(20),20,40); //21
    g.drawString(" s1.ab(20)      " + s1.ab(20),20,60);  //21
  }}
class thisthis
{
    static int b=1;
    public  int ab(int a)
    {  if(a>=0) return a+this.b;//==if(a>=0) return a+b;  this可加可不加
       else return -a+this.b ; }//==else return -a+b;  this可加可不加
   
}
class ssuper extends thisthis
{
    static int b=6;
    public  int ab(int a)
    {  if(a>=0) return a+super.b;    //此方法中若把super改为this，则paint方法第二条语句输出26
       else return -a+super.b ; }
   
}
class key
{  int zhongliang; 
   key(lock lock1)
    {zhongliang=lock1.zhl/3;}
}
class lock
{  int zhl;
   key lockkey; 
   lock(int x)
   { zhl=x;
    lockkey=new key(this);}
}