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Message:

abstract class Graphics

Posted by Kishori Sharan on January 23, 2001 at 1:08 PM

static void main(String args[]){
three th= new three();
one a;
th.display(a);
in the above code you are using a in th.display(a), but before that line you haven't put any reference in a. In one a; you have just declared that a will hold a reference to an object of class one or its descendatant. But, in one a; a doesn't hold any reference. So , you must write something like a = ... before you say th.display(a) , because th.display the actual reference stored in a .