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01/07/2009 at 08:06AM PST, ID: 24031872
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7.6

Inheritance -- 'extends'

Asked by jaggernat in Java Programming Language

hi guys

I have three classes

MainCarrierHelper, CommonHelper, BaseHelper

BaseHelper contains 3 methods :

public abstract class BaseHelper{
public abstract boolean add()
public abstract boolean update()
public abstract boolean delete()
}

they are all implimented in MainCarrierHelper.

 
CommonHelper is my new class which contains validation method code.

CommonHelper {

public boolean validateFields1(){
//validation code goes here
boolean status = true;
if(errors){
return false;
}
return status ;
}

validateFields2(){
// validation  code goes here
boolean status = true;
if(errors){
return false;
}
return status ;
}

     
MainCarrierHelper is the actual class in which i want to impliment the methods add, update and delete (which are defined in BaseHelper) and also call the validation methods which are defined in CommonHelper.
so i want to use this format

MainCarrierHelper extends CommonHelper extends BaseHelper

but the problem is i dont want to impliment the add() , update() and delete() methods in CommonHelper because i am already doing that in the MainCarrierHelper.
Right now when i create a new class CommonHelper and extend it to BaseHelper like this

 CommonHelper extends BaseHelper

i get error, you need to impliment the add() , update() and delete() methods..

any idea how i can avoid getting that error

thx v much
J
[+][-]01/07/09 08:12 AM, ID: 23316241

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Zone: Java Programming Language
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Solution Provided By: gkern
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[+][-]01/07/09 08:13 AM, ID: 23316259

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[+][-]01/07/09 08:33 AM, ID: 23316527

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[+][-]01/07/09 08:35 AM, ID: 23316550

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[+][-]01/08/09 09:16 AM, ID: 23327204

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20091111-EE-VQP-91 - Hierarchy / EE_QW_3_20080625