[ajug-members] casting

[Marc Lawson]

If you want  the Subtractor class to be able to use the showadder()  
method in Adder then you need to have subtractor extend Adder.....

public class Subtractor extends Adder{
}


On Jul 1, 2008, at 4:12 PM, 521 wrote:

> can I only cast up/down a hierarchy?
>
> per below, what would the syntax be in order for a 'Subtractor'  
> object use
> the Adders classes' showadder method?  would it be like this- to cast
> Adder 'type' on the sub object- that is, in order to get to an Adder's
> method? (Adder)sub.showadder
>
>
> [code]
> public class ProgramDisplayer {
> 	public static void main(String args[]) {
> 		System.out.println("Hi!");
>
> 		Adder add = new Adder();
> 		add.showadder();
>
> 		Subtractor sub = new Subtractor();
> 		sub.showsubtractor();
> 	}	
> }
> [/code]
> [code]
> public class Adder{
> 	public void showadder() {
> 		int low = 0;int high = 9;int count=low;
> 		while(count<high){System.out.println(count);count++;}
> 	}
> }
> [/code]
> [code]
> public class Subtractor {
> 	public void showsubtractor() {
> 		int low = -10;int high = 0;int count=high;
> 		while(count>low){System.out.println(count);count--;}
> 	}
> }
> [/code]
>
> Thanks,
>
> Barclay
>
>
>
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