Solved

ActionListener error

Posted on 2011-02-22
8
389 Views
Last Modified: 2012-05-11
ok, if you're a java programmer you might want to avert your eyes, the code here is a mess but i'm trying to work through a problem and i can't see why the 'actionlistener' is giving an error i.e. eclipse is underlining it in red and giving an error message,  any suggestions please

import java.awt.FlowLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import javax.swing.*;

public class BookGUI extends JFrame implements ActionListener

{

      String title  = "";
      
    public static final int WIDTH = 300;
    public static final int HEIGHT = 200;

    //Creates & displays a window of the class FlowLayoutDemo
    public static void main(String[] args)
    {
        BookGUI gui = new BookGUI( );
        gui.setVisible(true);
    }
 
       
    public BookGUI( )
    {
        setSize(WIDTH, HEIGHT);
        addWindowListener(new WindowDestroyer( ));
        setTitle("GUI Assignment");
        Container content = getContentPane( );

        content.setLayout(new FlowLayout());
        //JButton yellowButton = new JButton("Yellow");
        //yellowButton.addActionListener(this);
        //contentPane.add(yellowButton);

        //else if (e.getActionCommand().equals("Yellow"))
        //contentPane.setBackground(Color.yellow);
       
        JButton button1 = new JButton("Title");
        content.add(button1);
        button1.addActionListener(this);
        //contentPane.add(button1);

    }
    public void actionPerformed(ActionEvent e)
    {
       
        if (e.getActionCommand().equals("Title"))
        title = JOptionPane.showInputDialog("Enter Title");
       
       
       
        JButton label2 = new JButton("Get Book Information");
        content.add(label2);

        JButton label3 = new JButton("Show Total Cost of Books");
        content.add(label3);
   
    }
}


0
Comment
Question by:t38
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 4
8 Comments
 
LVL 92

Expert Comment

by:objects
ID: 34956144
       title = JOptionPane.showInputDialog("Enter Title");

title is not defined
0
 
LVL 92

Expert Comment

by:objects
ID: 34956156
scrastch that, didn't see it

you need to define content


        Container content = getContentPane( );

        JButton label2 = new JButton("Get Book Information");
        content.add(label2);

        JButton label3 = new JButton("Show Total Cost of Books");
        content.add(label3);
0
 

Author Comment

by:t38
ID: 34956279
Thanks for the quick response, much appreciated, could you look at the attached screenshot please?  for some reason that i can't fathom eclipse is showing an error in the actionlistener but the screenshots should illustrate the problem..

 error1 error2
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 34956401
your missing the import for ActionListener

import java.awt.event.ActionListener;
0
 

Author Comment

by:t38
ID: 34956452
thanks a lot, i've a lot to learn..  
0
 

Author Comment

by:t38
ID: 34956459
one final question, when i run this it displays as a blank frame, not buttons, any suggestions please?
0
 

Author Comment

by:t38
ID: 34956471
that's ok, i got that one, i had commented out the content pane section, thanks for all your help.
0
 
LVL 92

Expert Comment

by:objects
ID: 34956474
>         //contentPane.add(button1);

you have commented out adding the button to your gui
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question