// INHERIT4

// a little bit on class hierarchy
// notice how I'm using variables defined in each subclass

public class inherit4 {
    public static void main(String args[]) {
	System.out.println(Data121.a121); // Output: 121
	System.out.println(Data12.a12);   // Output: 12
	System.out.println(Data1.a1);     // Output: 1
    } 
}

class Data1                  { static int a1=1;     }
class Data11  extends Data1  { static int a11=11;   }
class Data12  extends Data1  { static int a12=12;   }
class Data121 extends Data12 { static int a121=121; }