Thread: Can't use button.addActionListener(this); ?

So.. In a nutshell, I am working on a basic GUI project. I have attempted to break everything down in to small factored down methods inside my class.
I am able to build my GUI this way, but now having issues when trying to create my ActionListener functionality. Here is the code I have below

package jLottery;
import java.awt.Color;
import java.awt.Container;
import java.awt.Event;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
 
import javax.swing.*;
 
public class jLottery {
	//create objects and vars
	static JFrame frame = new JFrame("The National Lottery");
	static Container con = frame.getContentPane();
	Random RandomNum = new Random();
 
	int matches = 0;
	int[] WinningNums = winningNUM();
 
	//Create Window
	public void CreateFrame (){
		frame.setSize(1200,800);
		frame.setVisible(true);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setAlwaysOnTop(true);
		frame.setResizable(false);
	}
 
	//Set Up Content Container
	public void CreateContainer(){
		con.setBackground(new Color(56,48,44));
		con.setLayout(new GridLayout(0,5));
	}
 
	//Add a Label
	public void AddHead(String i) {
	    JLabel label = new JLabel(i);
	    label.setFont(new Font("Sans-Serif", Font.BOLD, 20));
	    label.setForeground(new Color(225,98,25));
	    con.add(label);
	}
 
	public void AddSubHead(String i) {
	    JLabel label = new JLabel(i);
	    label.setFont(new Font("Sans-Serif", Font.PLAIN, 20));
	    label.setForeground(new Color(225,98,25));
	    con.add(label);
	}
 
 
	//function to create check boxes and add them to frame ( complete with action listeners )
	public void AddCheckButton(int i){
		String ButtonNum = Integer.toString(i);
		JCheckBox select = new JCheckBox(ButtonNum);
		select.setBackground(new Color(56,48,44));
		select.setForeground(new Color(225,255,255));
 
		con.add(select);
		select.addActionListener(this);		
	}
 
	public void AddButton(String i){
		JButton button = new JButton(i);
		button.setBackground(new Color(225, 98, 25));
		button.setForeground(new Color(255, 255, 255));
		button.setFont(new Font("Sans-Serif", Font.BOLD, 20));
 
		con.add(button);
		button.addActionListener(this);
	}

Here is my implementation code:

package jLottery;
 
import java.util.Scanner;
 
public class jMain {
 
	/**
	 * @param args
	 */
	public static void main(String[] args) {
	jLottery lottery = new jLottery();
		//create our main window and container	
		lottery.CreateFrame();
		lottery.CreateContainer();
 
		//create our Header
		lottery.AddHead("The Lottery: ");
		//create our subHeader
		lottery.AddSubHead("Pick Six ");
 
		lottery.AddHead("");//spacer
		lottery.AddHead("");//spacer
		lottery.AddHead("");//spacer
 
		//add our check-buttons
		for (int i=0; i<35; i++){
			lottery.AddCheckButton((i+1));
		}
 
		//add our submit button
		lottery.AddButton("Play!");
}

The main issue I am having is that it is not letting me use:
select.addActionListener(this);
or
button.addActionListener(this);

On a side note, my layout is very inconsistent, and appears to often show partial amounts of components when ran.


Is my breaking down/factoring approach all wrong? I am just trying to avoid a huge long class (as would be the case with all the formatting and options etc)

Originally Posted by copeg

To add an ActionListener to a JButton (or other component with an addActionListener method), the must add an object that implements the ActionListener interface. I recommend reading the following:
How to Write an Action Listener (The Java™ Tutorials > Creating a GUI With JFC/Swing > Writing Event Listeners)
Further, I recommend reading about code conventions
Code Conventions for the Java Programming Language
Methods should start with lowercase letters, classes with uppercase letters. One might consider this nit-picky, but not following conventions makes it that much harder to read code.

Thank you so much. I read through that documentation. Just simply had to add the "implements" to my class and I am now able to trigger action events
As for the conventions, I am a little sloppy with that agreed, I am still a student though so still learning. Also, I was using a lot of C# last semester, that uses Camel Caps for method names, so I guess it is an issue of adjusting.