class A{
int a,b;
public A(int a){ this.a=a; }
public A(int a,int b){
	   this(a);              //ͬ췽
	   this.b=b;            //ʵǰݳԱ
}
public int add(){  return a+b;  }
public void display(){
	   System.out.println("a="+a+",b="+b);
	   System.out.println("a+b="+this.add());          //ʵǰĳԱ
}
}
public class ThisDemo{
public static void main(String[]args){
	  A a=new A(5,8);
	  a.display();
}
}