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addActionListeners method undefined que from a newb [message #695060]

Sun, 10 July 2011 22:36

mark jones

Messages: 1
Registered: July 2011

Junior Member

Hi Guys, I'm learning Java going through CS106a online along with the recommended book and picking things up...have a newb que if anyone can point me in the right direction it would be appreciated....Here's the program taken from the book and i've highlighted the two probs in red.

the first says WEST cannot be resolved to a variable
the second says the method addActionListeners is undefined

Cheers, Mark

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

/*
* This program puts up a button on the screen, which triggers a
* message inspired by douglas Adam's Novel.
*/

public class HitcherhikerButton extends ConsoleProgram {

/* Initializes the user-interface buttons */
public void init() {
add(new JButton("RED"), WEST);
addActionListeners();
}

/* Responds to a button action */
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("RED")) {
println("Please do not press this button again.");
}
}
}

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Re: addActionListeners method undefined que from a newb [message #696349 is a reply to message #695060]

Wed, 13 July 2011 17:34

Eric Rizzo

Messages: 3070
Registered: July 2009

Senior Member

This forum is for discussions related specifically to Eclipse, not
general Java programming questions. Try www.stackoverflow.com for
general programming help.

Having said that... it's impossible to know what's going on without
seeing the ConsoleProgram class that you're extending.

Eric

On 7/10/11 6:36 PM, mark jones wrote:
> Hi Guys, I'm learning Java going through CS106a online along with the
> recommended book and picking things up...have a newb que if anyone can
> point me in the right direction it would be appreciated....Here's the
> program taken from the book and i've highlighted the two probs in red.
> the first says WEST cannot be resolved to a variable the second says the
> method addActionListeners is undefined
>
> Cheers, Mark
>
> import acm.program.*;
> import java.awt.event.*;
> import javax.swing.*;
>
> /*
> * This program puts up a button on the screen, which triggers a *
> message inspired by douglas Adam's Novel.
> */
>
> public class HitcherhikerButton extends ConsoleProgram {
>
> /* Initializes the user-interface buttons */
> public void init() {
> add(new JButton("RED"), WEST);
> addActionListeners();
> }
>
> /* Responds to a button action */
> public void actionPerformed(ActionEvent e) {
> if (e.getActionCommand().equals("RED")) {
> println("Please do not press this button again.");
> }
> }
> }
>
>
>

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