Monitor progresses of tasks in JSwing

Monitoring the progress of tasks is a friendly design for users, especially for tasks that take a long time. In this tutorial, we will teach you to use the progress bar of Java Swing to monitor the progress of tasks.

You will learn how to:

Understanding event handler "stateChanged" timing of the use
Creating an event handler to show progress when the value is changed

Prerequisites

Before you begin to read this tutorial, you must:

Familiar with Java swing development, go to oracle Java Swing to get the tutorial.
Read the first three tutorials on JSwing.
Familiar with the Operation of Apache NetBeans.
Familiar with the timing and object of stateChanged be called.

Create a MonitorProgress Form

Create a JFrame class named MonitorProgress on the form of the packages, and then drag the necessary components onto the form, the tree diagram as shown in the following figure.

Change the properties of the components as shown in the table below.

Components	text	actionCommand	name
jButton1	Start	Start	Start
jButton2	Exit	Exit	Exit
jLbael1	Phase-1
jLbael2	Phase-2
jLbael3	Phase-3
jLbael4	Phase-4
jLbael5	Phase-5
jCheckBox1	Check-1		Check-1
jCheckBox2	Check-2		Check-2
jCheckBox3	Check-3		Check-3
jCheckBox4	Check-4		Check-4
jCheckBox5	Check-5		Check-5
jProgressBar1			P0
jProgressBar2			P1
jProgressBar3			P2
jProgressBar4			P3
jProgressBar5			P4
jProgressBar6			P5

After the successful step above, Press Ctrl-S to save the file, and press F9 to Compile the Form, shown as the following.

Create a MonitorProgress App

Create a Java class named MonitorProgress on the app of the Packages, and then add code to the Class.

package app;

import java.util.logging.Level;
import java.util.logging.Logger;
import jswing.application.*;

public final class MonitorProgress extends App {

    public static void main(String args[]) {

        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                Form.open("form.MonitorProgress","MonitorProgress");
                UserInterface.initialize("app.MonitorProgress",Form.getCurrentForm());
            }
        });
    }
    
    @Override
    public void stateChanged(java.awt.Component component) {
        if(component.equals(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P1"))) ||
           component.equals(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P2"))) ||     
           component.equals(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P3"))) ||     
           component.equals(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P4"))) ||
           component.equals(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P5")))) {
            //System.out.println("stateChanged");
            ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P1")).update(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P1")).getGraphics());
            ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P2")).update(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P2")).getGraphics());
            ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P3")).update(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P3")).getGraphics());
            ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P4")).update(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P4")).getGraphics());
            ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P5")).update(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P5")).getGraphics());
            int i = ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P1")).getValue() * 20 / 100 +
                    ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P2")).getValue() * 20 / 100 +
                    ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P3")).getValue() * 20 / 100 +
                    ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P4")).getValue() * 20 / 100 +
                    ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P5")).getValue() * 20 / 100;
            ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P0")).setValue(i);
            ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P0")).update(((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P0")).getGraphics());
        }
    }
    
    @Override
    public void actionPerformed(java.awt.event.ActionEvent e){
        String action = e.getActionCommand();
        switch(action){
            case "Start":
                start();
                break;
            case "Exit":
                System.exit(0);
                break;
        }
    }
    private void start() {
        for(int i = 0; i <= 100; i ++){
                ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P1")).setValue(i);
            try {
                Thread.sleep(10);
            } catch (InterruptedException ex) {
                Logger.getLogger(MonitorProgress.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-1")).setSelected(true);
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-1")).update(((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-1")).getGraphics());
        
        for(int i = 0; i <= 100; i ++){
                ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P2")).setValue(i);
            try {
                Thread.sleep(10);
            } catch (InterruptedException ex) {
                Logger.getLogger(MonitorProgress.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-2")).setSelected(true);
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-2")).update(((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-2")).getGraphics());
        
        for(int i = 0; i <= 100; i ++){
                ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P3")).setValue(i);
            try {
                Thread.sleep(10);
            } catch (InterruptedException ex) {
                Logger.getLogger(MonitorProgress.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-3")).setSelected(true);
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-3")).update(((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-3")).getGraphics());    
        
        for(int i = 0; i <= 100; i ++){
                ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P4")).setValue(i);
            try {
                Thread.sleep(10);
            } catch (InterruptedException ex) {
                Logger.getLogger(MonitorProgress.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-4")).setSelected(true);
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-4")).update(((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-4")).getGraphics());
        for(int i = 0; i <= 100; i ++){
                ((javax.swing.JProgressBar)Form.getCurrentForm().getComponentByName("P5")).setValue(i);
            try {
                Thread.sleep(10);
            } catch (InterruptedException ex) {
                Logger.getLogger(MonitorProgress.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-5")).setSelected(true);
        ((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-5")).update(((javax.swing.JCheckBox)Form.getCurrentForm().getComponentByName("Check-5")).getGraphics());
    }
}

Code Explained

stateChanged.
stateChanged gets called when the value is changed. In this tutorial, we assign a task consisting of five steps, all steps have their progress, and finally, the progress of tasks gets counted through sub-steps.

Run application

Press Ctrl-S to save the file, Shift-F6 to Run the application, and then you will see the progress of tasks when Press start.

Exercises

Design an application that copies a file and displays the progress.

Next steps

Click download source code or next for more tutorials.