[ajug-members] casting

[Thomas, Dave]

2 ways: override toString or use interfaces.  In either case don't
couple your code to System.out

public interface Displayable{
	Public String display();
}

public class Adder implements Displayable{
	public String display(){
		int low = 0;int high = 9;int count=low;
		String retval="";
		while(count<high){retval += count + "\n";count++;}
	}
}

in main you do 
Displayable k = new Adder();
System.out.println(k.display());

-----Original Message-----
From: 521 [mailto:521 at ofig.org] 
Sent: Tuesday, July 01, 2008 1:12 PM
To: ajug-members at ajug.org
Subject: [ajug-members] casting

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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