Today in Java, i will teach you how to create a progressbar component using JProgressBar control in Java.

So, now let's start this tutorial!

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

2. Import javax.swing.* package because we will going to have the JProgressBar, JFrame, SwingUtilities in swing and also the JPanel as the container of this.

1. import
   
   javax.swing.*
   
   ;
   

3. Initialize a variable for JProgressBa and named it as pbar. This will be below in your public class ProgressBar extends JPanel.

1. public
   
   class
   
   ProgressBar extends
   
   JPanel
   
   {
   
2. JProgressBar
   
   pbar;
   

4. Create a constructor that is the same with the filename that will instantiate the JProgressBar, sets the minimum and maximum value of the progressbar, and will add this component in the JPanel.

1. public
   
   ProgressBar(
   
   )
   
   {
   
2. pbar =
   
   new
   
   JProgressBar
   
   (
   
   )
   
   ;
   
3. pbar.setMinimum
   
   (
   
   0
   
   )
   
   ;
   
4. pbar.setMaximum
   
   (
   
   100
   
   )
   
   ;
   
5. add(
   
   pbar)
   
   ;
   
6. }
   

5. Create also a method named updateBar and has variable newValue as Integer because this will be used to update the progress of the bar using the loop.

1. public
   
   void
   
   updateBar(
   
   int
   
   newValue)
   
   {
   
2. pbar.setValue
   
   (
   
   newValue)
   
   ;
   
3. }
   

6. In your Main, instantiate the ProgressBar constructor that has the new keyword and make it final.

1. final
   
   ProgressBar it =
   
   new
   
   ProgressBar(
   
   )
   
   ;
   

Set the title.

1. JFrame
   
   frame =
   
   new
   
   JFrame
   
   (
   
   "Progress Bar Component"
   
   )
   
   ;
   

Set the windows characteristics.

1. frame.setDefaultCloseOperation
   
   (
   
   JFrame
   
   .EXIT_ON_CLOSE
   
   )
   
   ;
   
2. frame.setContentPane
   
   (
   
   it)
   
   ;
   
3. frame.pack
   
   (
   
   )
   
   ;
   
4. frame.setVisible
   
   (
   
   true
   
   )
   
   ;
   
5. frame.setLocation
   
   (
   
   300
   
   ,250
   
   )
   
   ;
   
6. frame.setSize
   
   (
   
   200
   
   ,150
   
   )
   
   ;
   

Create a For Loop statement that the minimum value is equal to 0 and maximum value is 100 that has an increment capability with an i variable as integer. Initialize percent variable as integer that will be equal to i with the final keyword.

1. for
   
   (
   
   int
   
   i =
   
   0
   
   ;
   
   i <=
   
   100
   
   ;
   
   i++
   
   )
   
   {
   
2. final
   
   int
   
   percent =
   
   i;
   

Now, create a try and catch method. In the try method, update the progressbar with it variable name and its value of for loop in percent variable using run method of SwingUtilities. And have a delay value of 100 millisecond. Then in the catch method, preferred to use the InterruptedException.

1. try
   
   {
   
2. SwingUtilities
   
   .invokeLater
   
   (
   
   new
   
   Runnable
   
   (
   
   )
   
   {
   
3. public
   
   void
   
   run(
   
   )
   
   {
   
4. it.updateBar
   
   (
   
   percent)
   
   ;
   
5. }
   
6. }
   
   )
   
   ;
   
7. java.lang
   
   .Thread
   
   .sleep
   
   (
   
   100
   
   )
   
   ;
   
8. }
   
   catch
   
   (
   
   InterruptedException
   
   e)
   
   {
   
9. ;
   
10. }
    

Press F5 to run the program.

Output:


Full source code:

1. import
   
   javax.swing.*
   
   ;
   
2. 
   
3. public
   
   class
   
   ProgressBar extends
   
   JPanel
   
   {
   
4. 
   
5. JProgressBar
   
   pbar;
   
6. 
   
7. 
   
8. public
   
   ProgressBar(
   
   )
   
   {
   
9. pbar =
   
   new
   
   JProgressBar
   
   (
   
   )
   
   ;
   
10. pbar.setMinimum
    
    (
    
    0
    
    )
    
    ;
    
11. pbar.setMaximum
    
    (
    
    100
    
    )
    
    ;
    
12. add(
    
    pbar)
    
    ;
    
13. }
    
14. 
    
15. public
    
    void
    
    updateBar(
    
    int
    
    newValue)
    
    {
    
16. pbar.setValue
    
    (
    
    newValue)
    
    ;
    
17. }
    
18. 
    
19. public
    
    static
    
    void
    
    main(
    
    String
    
    args[
    
    ]
    
    )
    
    {
    
20. 
    
21. final
    
    ProgressBar it =
    
    new
    
    ProgressBar(
    
    )
    
    ;
    
22. 
    
23. JFrame
    
    frame =
    
    new
    
    JFrame
    
    (
    
    "Progress Bar Component"
    
    )
    
    ;
    
24. frame.setDefaultCloseOperation
    
    (
    
    JFrame
    
    .EXIT_ON_CLOSE
    
    )
    
    ;
    
25. frame.setContentPane
    
    (
    
    it)
    
    ;
    
26. frame.pack
    
    (
    
    )
    
    ;
    
27. frame.setVisible
    
    (
    
    true
    
    )
    
    ;
    
28. frame.setLocation
    
    (
    
    300
    
    ,250
    
    )
    
    ;
    
29. frame.setSize
    
    (
    
    200
    
    ,150
    
    )
    
    ;
    
30. 
    
31. 
    
32. for
    
    (
    
    int
    
    i =
    
    0
    
    ;
    
    i <=
    
    100
    
    ;
    
    i++
    
    )
    
    {
    
33. final
    
    int
    
    percent =
    
    i;
    
34. try
    
    {
    
35. SwingUtilities
    
    .invokeLater
    
    (
    
    new
    
    Runnable
    
    (
    
    )
    
    {
    
36. public
    
    void
    
    run(
    
    )
    
    {
    
37. it.updateBar
    
    (
    
    percent)
    
    ;
    
38. }
    
39. }
    
    )
    
    ;
    
40. java.lang
    
    .Thread
    
    .sleep
    
    (
    
    100
    
    )
    
    ;
    
41. }
    
    catch
    
    (
    
    InterruptedException
    
    e)
    
    {
    
42. ;
    
43. }
    
44. }
    
45. }
    
46. }
    

Best Regards,

Engr. Lyndon Bermoy
IT Instructor/System Developer/Android Developer/Freelance Programmer

If you have some queries, feel free to contact the number or e-mail below.
Mobile: 09488225971
Landline: 826-9296
E-mail:[email protected]

Add and Follow me on Facebook: https://www.facebook.com/donzzsky

Visit and like my page on Facebook at: https://www.facebook.com/BermzISware

Download