Java Program to Progress a Progress Bar by 5 Units on Every Click of Push Button


This is a Java Program to Progress a Progress Bar by 5 Units on Every Click of Push Button

Problem Description

We have to write a program in Java such that it creates a Progress Bar and a Push Button. Every time the push button is clicked the progress bar is progressed by 5 units.

Expected Input and Output

For progressing the progress bar, we can have the following different sets of input and output.


1. To Display the Progress Bar:

When the program is being executed,
it is expected that a progress bar is created with initial value zero.

2. To Progress the Progress Bar:

Every time the push button is clicked,
it is expected that the progress bar progresses by 5 units.
Problem Solution

1. Create a frame containing a progress bar and push button.
2. Set the initial value of the progress bar to zero.
3. Every time the push button is clicked, increase the progress bar by 5 units.

Program/Source Code

Here is source code of the Java Program to progress the progress bar. The program is successfully compiled and tested using javac compiler on Fedora 30. The program output is also shown below.

  1. /* Java Program to progress the progress bar*/
  2. import javax.swing.*;
  3. import java.awt.*;
  4. import java.awt.event.*;
  5. class Progress_Bar implements ActionListener
  6. {
  7.     static JProgressBar bar;
  8.     //Driver function
  9.     public static void main(String args[])
  10.     {
  11. 	//Create a frame
  12. 	JFrame frame = new JFrame("Progress Bar");
  13. 	frame.setSize(500,500);
  14. 	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  15. 	frame.getContentPane().setBackground(Color.white);
  16. 	frame.setLayout(null);
  17. 	//Create an object
  18. 	Progress_Bar obj = new Progress_Bar();
  19. 	//Create a Progress Bar
  20. 	bar = new JProgressBar();
  21. 	bar.setValue(0);
  22. 	bar.setStringPainted(true);
  23. 	bar.setBounds(150,100,200,50);
  24. 	frame.add(bar);
  25. 	//Create a button
  26. 	JButton increase = new JButton("Increase");
  27. 	increase.setBounds(200,250,100,50);
  28. 	increase.addActionListener(obj);
  29. 	frame.add(increase);
  30. 	//Display the frame
  31. 	frame.setVisible(true);
  32.     }
  33.     //Function to progress the progress bar
  34.     public void actionPerformed(ActionEvent e)
  35.     {
  36.         bar.setValue(bar.getValue()+5);
  37.     }
  38. }
Program Explanation

1. Create a progress bar using JProgressBar class.
2. To set the value of the progress bar use setValue function.
3. To get the present value of progress bar use getValue function.
4. To display the value of the progress bar within the bar use setStringPainted(true).

Runtime Test Cases

Here’s the run time test case to show the progress the progress bar.

Test case 1 – To View the Progress Bar.

Test case 2 – To Progress the Progress Bar.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn