This tutorial will teach you how to create a progress monitor in java. A ProgressMonitor class simply monitors a progress in any operation. Hence, we will not use the JProgressBar component here.

So, now let's start this tutorial!

1. Open JCreator or NetBeans and make a java program with a file name of progressMonitor.java.

2. Import the following package library:

1. import
   
   javax.swing.*
   
   ;
   
2. import
   
   java.awt.*
   
   ;
   
3. import
   
   java.awt.event.*
   
   ;
   

3. Declare the static global variables. To access the progress monitor in java, we will use the ProgressMonitor class. Have also the Timer and an Integer variable named progress.

1. static
   
   ProgressMonitor
   
   monitor;
   
2. static
   
   int
   
   progress;
   
3. static
   
   Timer
   
   timer;
   

4. Initialize your variables of the components in your Main.

1. JFrame
   
   frame =
   
   new
   
   JFrame
   
   (
   
   "Progress Monitor"
   
   )
   
   ;
   
2. JButton
   
   progressButton =
   
   new
   
   JButton
   
   (
   
   "Click This!"
   
   )
   
   ;
   

5. Now, we will create an ActionListener named progressButtonActionListener to perform the action when clicking the progressButton variable.

Here we will use the Component class to get the component which will perform the action and will use the variable monitor of the ProgressMonitor. We will indicate 0 as the starting number and 100 as our maximum number. And have your variable progress initializes to 0.

1. ActionListener
   
   progressButtonActionListener =
   
   new
   
   ActionListener
   
   (
   
   )
   
   {
   
2. public
   
   void
   
   actionPerformed(
   
   ActionEvent
   
   actionEvent)
   
   {
   
3. Component
   
   parent =
   
   (
   
   Component
   
   )
   
   actionEvent.getSource
   
   (
   
   )
   
   ;
   
4. monitor =
   
   new
   
   ProgressMonitor
   
   (
   
   parent, "Loading Progress"
   
   , "Getting Started..."
   
   , 0
   
   , 100
   
   )
   
   ;
   
5. progress =
   
   0
   
   ;
   

We can have our Progress Monitor if it is not null. Then insert inside if the timer is null put then again that the monitor variable will return its value. And if clicking the button Cancel it will display Monitor canceled. Otherwise the progress will continue its load that will increment its progress by 2 (by putting inside the progress variable in the monitor variable of Progress Monitor). Then it will have its note of Loading its percentage by incrementing it to 2 and will stop at 100 as we declared that above.

1. if
   
   (
   
   monitor !=
   
   null
   
   )
   
   {
   
2. if
   
   (
   
   timer ==
   
   null
   
   )
   
   {
   
3. timer =
   
   new
   
   Timer
   
   (
   
   250
   
   , new
   
   ActionListener
   
   (
   
   )
   
   {
   
4. public
   
   void
   
   actionPerformed(
   
   ActionEvent
   
   e)
   
   {
   
5. if
   
   (
   
   monitor ==
   
   null
   
   )
   
6. return
   
   ;
   
7. if
   
   (
   
   monitor.isCanceled
   
   (
   
   )
   
   )
   
   {
   
8. System
   
   .out
   
   .println
   
   (
   
   "Monitor canceled"
   
   )
   
   ;
   
9. timer.stop
   
   (
   
   )
   
   ;
   
10. }
    
    else
    
    {
    
11. progress +=
    
    2
    
    ;
    
12. monitor.setProgress
    
    (
    
    progress)
    
    ;
    
13. monitor.setNote
    
    (
    
    "Loading: "
    
    +
    
    progress +
    
    "%"
    
    )
    
    ;
    
14. }
    
15. }
    
16. }
    
    )
    
    ;
    
17. }
    

Now, start the timer.

1. timer.start
   
   (
   
   )
   
   ;
   

Put the ActionListener variable to our created button.

1. progressButton.addActionListener
   
   (
   
   progressButtonActionListener)
   
   ;
   

6. Add the button using the add method of the frame. Set its layout to GridLayout using the setLayout method. Lastly, set the size, visibility, and have its close operation of the frame.

1. frame.getContentPane
   
   (
   
   )
   
   .add
   
   (
   
   progressButton)
   
   ;
   
2. frame.getContentPane
   
   (
   
   )
   
   .setLayout
   
   (
   
   new
   
   GridLayout
   
   (
   
   0
   
   , 1
   
   )
   
   )
   
   ;
   
3. frame.setSize
   
   (
   
   300
   
   , 200
   
   )
   
   ;
   
4. frame.setVisible
   
   (
   
   true
   
   )
   
   ;
   
5. frame.setDefaultCloseOperation
   
   (
   
   JFrame
   
   .EXIT_ON_CLOSE
   
   )
   
   ;
   

Output:


Here's the full code of this tutorial:

1. import
   
   javax.swing.*
   
   ;
   
2. import
   
   java.awt.*
   
   ;
   
3. import
   
   java.awt.event.*
   
   ;
   
4. 
   
5. public
   
   class
   
   progressMonitor{
   
6. 
   
7. static
   
   ProgressMonitor
   
   monitor;
   
8. static
   
   int
   
   progress;
   
9. static
   
   Timer
   
   timer;
   
10. 
    
11. public
    
    static
    
    void
    
    main(
    
    String
    
    args[
    
    ]
    
    )
    
    {
    
12. JFrame
    
    frame =
    
    new
    
    JFrame
    
    (
    
    "Progress Monitor"
    
    )
    
    ;
    
13. JButton
    
    progressButton =
    
    new
    
    JButton
    
    (
    
    "Click This!"
    
    )
    
    ;
    
14. 
    
15. ActionListener
    
    progressButtonActionListener =
    
    new
    
    ActionListener
    
    (
    
    )
    
    {
    
16. public
    
    void
    
    actionPerformed(
    
    ActionEvent
    
    actionEvent)
    
    {
    
17. Component
    
    parent =
    
    (
    
    Component
    
    )
    
    actionEvent.getSource
    
    (
    
    )
    
    ;
    
18. monitor =
    
    new
    
    ProgressMonitor
    
    (
    
    parent, "Loading Progress"
    
    , "Getting Started..."
    
    , 0
    
    , 100
    
    )
    
    ;
    
19. progress =
    
    0
    
    ;
    
20. if
    
    (
    
    monitor !=
    
    null
    
    )
    
    {
    
21. if
    
    (
    
    timer ==
    
    null
    
    )
    
    {
    
22. timer =
    
    new
    
    Timer
    
    (
    
    250
    
    , new
    
    ActionListener
    
    (
    
    )
    
    {
    
23. public
    
    void
    
    actionPerformed(
    
    ActionEvent
    
    e)
    
    {
    
24. if
    
    (
    
    monitor ==
    
    null
    
    )
    
25. return
    
    ;
    
26. if
    
    (
    
    monitor.isCanceled
    
    (
    
    )
    
    )
    
    {
    
27. System
    
    .out
    
    .println
    
    (
    
    "Monitor canceled"
    
    )
    
    ;
    
28. timer.stop
    
    (
    
    )
    
    ;
    
29. }
    
    else
    
    {
    
30. progress +=
    
    2
    
    ;
    
31. monitor.setProgress
    
    (
    
    progress)
    
    ;
    
32. monitor.setNote
    
    (
    
    "Loading: "
    
    +
    
    progress +
    
    "%"
    
    )
    
    ;
    
33. }
    
34. }
    
35. }
    
    )
    
    ;
    
36. }
    
37. timer.start
    
    (
    
    )
    
    ;
    
38. }
    
39. }
    
40. }
    
    ;
    
41. 
    
42. 
    
43. progressButton.addActionListener
    
    (
    
    progressButtonActionListener)
    
    ;
    
44. 
    
45. frame.getContentPane
    
    (
    
    )
    
    .add
    
    (
    
    progressButton)
    
    ;
    
46. frame.getContentPane
    
    (
    
    )
    
    .setLayout
    
    (
    
    new
    
    GridLayout
    
    (
    
    0
    
    , 1
    
    )
    
    )
    
    ;
    
47. frame.setSize
    
    (
    
    300
    
    , 200
    
    )
    
    ;
    
48. frame.setVisible
    
    (
    
    true
    
    )
    
    ;
    
49. frame.setDefaultCloseOperation
    
    (
    
    JFrame
    
    .EXIT_ON_CLOSE
    
    )
    
    ;
    
50. }
    
51. }
    

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Best Regards,

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IT Instructor/System Developer/Android Developer/Freelance Programmer
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E-mail:[email protected]

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