Thread: Threading not functioning

Hello,

I'm currently working on a project that executes queries to the database. This process takes a long time to be finished, so I would like the user to be able to use the JFrame while its processing. The solution I found is using Threads.

I never used it before and after some tutorials online I found a way to use it. The problem is, the JFrame is still freezing even when the query is executed within a thread. (I think)

Because the project is private I can't post the code here. I did however create an example code to make my (maybe mistake or problem) clear. The project has the follwing structure:

[Package]
[--> class] Main
[--> class] Form (extends JFrame)
[--> class] Timer (implements Runnable)

The way I coded this is as follows:

Main class:

package Package;
 
import java.awt.Color;
 
import javax.swing.ImageIcon;
import javax.swing.JFrame;
 
public class Main {
 
	public static void main(String[] args) 
	{
		Form form = new Form();	
		form.setVisible(true);
        	form.setSize(288, 435);
        	form.setResizable(false);
        	form.setLayout(null);
        	form.getContentPane().setBackground(Color.black);
        	form.setIconImage(new ImageIcon(form.getClass().getResource("http://www.java-forums.org/images/Marque-it.ico")).getImage());
        	form.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

Form class:

package Package;
 
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
 
import javax.swing.*;
 
public class Form extends JFrame implements MouseListener  {
 
	private static final long serialVersionUID = 1L;
 
	private Thread[] treadList;
 
	public Form ()
	{
		// Use a null layout
		setLayout(null);
 
		// Load buttons and images ect
		loadDesign();
 
		// Create new threads
		for(int i = 0; i < treadList.length; i++)
		{
 
			treadList[i] = new treadList(new Timer(5000, this));
			treadList[i].start();
		}
 
         }
 
}

Timer class:

package Package;
 
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.MalformedURLException;
import java.net.URL;
 
 
//public class Timer implements Runnable {
public class Timer implements Runnable
{
	 Toolkit toolkit;
	 int seconds;
	 private Form frm;
 
	public Timer(int seconds, Form frm)
	{
	    toolkit = Toolkit.getDefaultToolkit();
 
	    this.seconds = seconds;
 
	    this.frm = frm;
 
	}
 
  javax.swing.Timer timer = new javax.swing.Timer(seconds, new ActionListener() 
    {
        public void actionPerformed(ActionEvent e) 
        {
        	// Do query what takes long time
        }
     });
 
 
 
	@Override
	public void run() {
		// TODO Auto-generated method stub
		System.out.println(Thread.currentThread());
		timer.start();
	}
 
}

I don't know what is wrong with this code? Although I need to say I don't have much experience with programming in Java. I also tried to use a SwingWorker but it's the same result.


Can someone help me?

Kind regards,

Mike Feonx