Hierarchical inheritance using Java in NetBeans

class b
{
   int number=2;
}
class c extends b
{
    
}
class d extends b
{
    
}
public class p20_hierarchicalinheritance {
    public static void main(String[] args) {
        d object1=new d();
        System.out.println(object1.number); 
        c object2=new c();
        System.out.println(object2.number);  
    }
}