Re: Problem with interface implementation

rossum <>
Sun, 14 Feb 2010 12:40:23 +0000
On Sun, 14 Feb 2010 01:24:55 -0800 (PST), Amr
<> wrote:

hi all,
im following an excercise from the book "Sams teach yourself java in
21 days"
i typed the exercise exactly as in the book but i get an error. below
are the error and the full code of the program.
thank you very much for your help.

Caused by: java.lang.RuntimeException: Uncompilable source code -
DayEleven.SurveryWizard is not abstract and does not override abstract
method actionPerformed(java.awt.event.ActionEvent) in

This is telling you that your class DayEleven.SurveryWizard does not
correctly override method actionPerformed(java.awt.event.ActionEvent)

That is where you need to look first for your error.

im doing this excercise in Netbeans and it gives an option to
'implement all abstract methods' to get rid of this error.
doing that allows the compilation, but can't when go forward with the
second interface.

package DayEleven;

import java.awt.event.*;
import javax.swing.*;
import java.awt.*;

* @author amr
public class SurveryWizard extends JPanel implements ActionListener{
   int currentCard=0;
   CardLayout cards=new CardLayout();
   SurveyPanel[] ask=new SurveyPanel[3];

   public SurveryWizard(){
       setSize(240, 140);
       //set up survery

       String question1="What is your gender";
       String[] response1={"female","male","not telling"};
       ask[0]=new SurveyPanel(question1,response1,2);
       String question2="What is your age";
       String[] response2={"Under 25","25-34","35-40","over 54"};
       ask[1]=new SurveyPanel(question1,response2,1);
       String question3="How often do you excercise each week";
       String[] responses3={"Never", "1-3 times","More than 3"};
       ask[2]=new SurveyPanel(question3,responses3,1);
       for(int i=0; i<ask.length;i++){

So, here is where you need to start looking.

   public void actionPerformed(ActiveEvent evt){

Look at the type of the parameter you are using here: ActiveEvent
Now go back and look at the typr of the parameter of the method you
are trying to override: ActionEvent

You are not overriding actionPerformed() but are overloading it
instead, which is probably not what you intended to do.


       },"Card "+currentCard);

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