superdemo.java

《Java语言程序设计》源代码 很好的JAVA入门的好的代码

class A{
int x,y;
public A(int x,int y){
	   this.x=x;
	   this.y=y;
}
public void display(){
	   System.out.println("In class A: x="+x+" , y="+y);
}
}
class B extends A{
int a,b;
public B(int x,int y,int a,int b){
	   super(x,y);
	   this.a=a;
	   this.b=b;
}
public void display(){
	   super.display();
	   System.out.println("In class B: a="+a+" , b="+b);
}
}
public class SuperDemo{
public static void main(String[]args){
	   B a=new B(1,2,3,4);
	   a.display();
}
}