JProgressBar class

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. }