How to create a loading bar in java

Question

I need to create a progress bar with java swing for a loading screen of my standalone application.

Answer 1

Here is a simple example of progress bar that progresses when you hover over the Button (Based on your picture) and you can do your background stuffs within the thread once the Mouse is over the button :-

import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JProgressBar;

public class GUI extends JFrame 
{
boolean isMouseOver = false;
int count = 0;

public GUI()
{
    this.setTitle("Progress Bar");
    this.setBounds(100, 100, 407, 119);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.getContentPane().setLayout(null);

    JProgressBar progressBar = new JProgressBar();
    progressBar.setBounds(10, 45, 371, 22);
    this.getContentPane().add(progressBar);

    JButton btnMousOver = new JButton("Mouse Over");
    btnMousOver.addMouseListener(new MouseAdapter()
    {
        public void mouseEntered(MouseEvent evt)
        {
            isMouseOver = true;
            btnMousOver.setEnabled(false);
            Thread go = new Thread()
            {
                public void run()
                {
                    while (isMouseOver && count < 101)
                    {
                        count = count + 2;
                        progressBar.setValue(count);
                        // do some stuffs here
                        try
                        {
                            Thread.sleep(100);
                        }
                        catch (InterruptedException e)
                        {
                            e.printStackTrace();
                        }
                    }
                }
            };
            go.start();

        }

        public void mouseExited(MouseEvent evt)
        {
            isMouseOver = false;
            btnMousOver.setEnabled(true);
        }

        public void mousePressed(MouseEvent evt)
        {
            JOptionPane.showMessageDialog(null, "Mouse CLicked");
        }

        public void mouseReleased(MouseEvent evt)
        {
            JOptionPane.showMessageDialog(null, "Mouse released");
        }
    });
    btnMousOver.setBounds(142, 11, 108, 23);

    this.getContentPane().add(btnMousOver);
    this.getContentPane().add(progressBar);
    this.setLocationRelativeTo(null);
    this.setVisible(true);

}

public static void main(String[] args)
{
    new GUI();
}
}