adddemo1.java

我在学习JAVA的讲义

class value1
{   int x,y;
    value1(int a,int b)
    {   x=a;
        y=b;
    }
}
class value2 extends value1
{   value2(int a,int b)
    {   super(a,b);
    }
}

public class AddDemo1
{   public static void main(String args[ ])
    {   int sum;
        value2 num=new value2(10,20);
        sum=num.x+num.y;
        System.out.println("add="+sum);
    }
}