JProgressBar class

The JProgressBar class is used to display the progress of the task.

Commonly used Constructors of JProgressBar class

• JProgressBar(): is used to create a horizontal progress bar but no string text.
• JProgressBar(int min, int max): is used to create a horizontal progress bar with the specified minimum and maximum value.
• JProgressBar(int orient): is used to create a progress bar with the specified orientation, it can be either Vertical or Horizontal by using SwingConstants.VERTICAL and SwingConstants.HORIZONTAL constants.
• JProgressBar(int orient, int min, int max): is used to create a progress bar with the specified orientation, minimum and maximum value.

Commonly used methods of JProgressBar class

1) public void setStringPainted(boolean b): is used to determine whether string should be displayed.

2) public void setString(String s): is used to set value to the progress string.

3) public void setOrientation(int orientation): is used to set the orientation, it may be either vertical or horizontal by using SwingConstants.VERTICAL and SwingConstants.HORIZONTAL constants..

4) public void setValue(int value): is used to set the current value on the progress bar.

Example of JProgressBar class

1. import javax.swing.*;  
2. public class MyProgress extends JFrame{  
3. JProgressBar jb;  
4. int i=0,num=0;  
5.   
6. MyProgress(){  
7. jb=new JProgressBar(0,2000);  
8. jb.setBounds(40,40,200,30);  
9.       
10. jb.setValue(0);  
11. jb.setStringPainted(true);  
12.       
13. add(jb);  
14. setSize(400,400);  
15. setLayout(null);  
16. }  
17.   
18. public void iterate(){  
19. while(i<=2000){  
20.   jb.setValue(i);  
21.   i=i+20;  
22.   try{Thread.sleep(150);}catch(Exception e){}  
23. }  
24. }  
25. public static void main(String[] args) {  
26.     MyProgress m=new MyProgress();  
27.     m.setVisible(true);  
28.     m.iterate();  
29. }  
30. }