Superclass reference to subclass object showing same behaviour as subclass reference to subclass object

Question

The following code in java, when run on elipse, gives same output even if we replace

superclass s=new sub();

with,

sub s= n         


        

Answer 1

you are creating Object of sub and assigning it to super's reference.if you dont 1)first case:-

superclass s=new sub();   
        s.supermethod();
        s.method();

in above case methods of sub will be called but these two method should be present in superclass also(if not present then compile time error)

2)second case:-

sub s=new sub();   
    s.supermethod();
    s.method();

in this also methods of sub will be ,these method may or may not be present super.