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:
Code :
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:
Code :
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:
Code :
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
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