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January 09, 2012

Creating basic Graphical User Interface (GUI) application in java with Screenshots

Hi all,

One of my friend asked me, how to create a basic java GUI application which can run on desktop?

A small java gui desktop application, which is having a button and when user click on it, it will show the status of the application.

Source code:

import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JOptionPane;

public class PSRSampleGUI
public static void main(String[] args) {
       
        // Creating a frame
        JFrame frame_name = new JFrame("PSR");
      
        //Setting the layout to view the content
        frame_name.setLayout(new FlowLayout());
      
        // Sample lable option
        JLabel label_name = new JLabel("Click Start button");
      
        // Creating a button
        JButton button_name = new JButton("Start");
      
        // Adding button to frame
        frame_name.add(label_name);
        frame_name.add(button_name);
      
        // Adding button functionality
        button_name.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent ae)
            {
                JOptionPane.showMessageDialog(null, "Started", "App Status", JOptionPane.INFORMATION_MESSAGE);
                // Call the method here ( the implemented method)
            }
        });
      
        // Displaying the frame in the center of the screen window
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension windowSize = frame_name.getSize();
        int windowX = Math.max(0, (screenSize.width  - windowSize.width ) / 2);
        int windowY = Math.max(0, (screenSize.height - windowSize.height) / 2);
        frame_name.setLocation(windowX,windowY);
      
        // Displaying the Frame with packing all the contents properly
        frame_name.setVisible(true);
        frame_name.pack();
    } // main method ends here
} // class ends here

Screenshots:
  • By Running the application, you will get the following window in the center of your screen.
  • After clicking on "Start" button, you will get the following window

If you have any queries, please mail to psrdotcom@gmail.com
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