Java tutorial
import java.awt.BorderLayout; import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JProgressBar; public class Main extends JFrame { static Main f1 = null; public static void main(String[] args) { JPanel panel1 = new JPanel(); JPanel panel2 = new JPanel(); JButton button = new JButton(); Main f = null; f = new Main(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setSize(700, 400); panel1.setLayout(new BorderLayout()); panel1.setForeground(Color.white); button.setText("Convert"); panel1.add(button, BorderLayout.SOUTH); f.setContentPane(panel1); f.setVisible(true); f1 = new Main(); f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f1.setSize(457, 100); f1.setTitle("Conversion Progress"); f1.setLocationRelativeTo(null); panel2.setLayout(new BorderLayout()); panel2.setForeground(Color.white); JProgressBar progressBar = new JProgressBar(); progressBar.setValue(35); progressBar.setStringPainted(true); panel2.add(progressBar, BorderLayout.SOUTH); f1.setContentPane(panel2); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { f1.setVisible(true); } }); } }