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Thread: Threading not functioning

  1. #1
    Junior Member
    Join Date
    Oct 2011
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    Default Threading not functioning


    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:

    [--> 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.setSize(288, 435);
            	form.setIconImage(new ImageIcon(form.getClass().getResource("http://www.java-forums.org/images/Marque-it.ico")).getImage());

    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
    		// Load buttons and images ect
    		// Create new threads
    		for(int i = 0; i < treadList.length; i++)
    			treadList[i] = new treadList(new Timer(5000, this));

    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
    	public void run() {
    		// TODO Auto-generated method stub

    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

  2. #2
    Administrator copeg's Avatar
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    Oct 2009
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    Default Re: Threading not functioning

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