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POhow to close a frame when button clicks
 

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  1. POhow to close a frame when button clicks
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    <p>I am new to Java Swing. I am creating a frame with some components.</p> <p>I have to close the frame and open another frame when the button is clicked. I had tried <code>setVisible(false)</code> but it only hides the frame, not closing it. When I use <code>System.exit(0)</code>, it closed all the frames.</p> <p>I had tried in another way, i.e. add all the components to panel, and add the panel at first. When the frame has to close I just remove those components in actionListener and add the other components for the corresponding next process.</p> <p>My entire code is as follows:</p> <pre><code>package JavaApp; import java.awt.Component; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.IOException; import java.security.NoSuchAlgorithmException; import java.util.logging.Level; import java.util.logging.Logger; import javax.crypto.IllegalBlockSizeException; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JTextField; import javax.swing.SwingUtilities; public class Login extends JFrame { public static JLabel labelUser; public static JLabel labelPass; public static JTextField textFieldUser; public static JPasswordField passwordField; public static JButton clear; public static JButton buttonLogin; public static JButton ChangePassword; public static JButton MasterKey; public static JButton AppKey; public static JPanel panelGnereate; public static JPanel panelLogin; public static JFrame frame; public static JLabel UserName; public static JTextField UserTxt; public static JButton GenerateKey; public static JPanel panelMaster; private static void designUI() { frame = new JFrame("Instalation"); frame.setLayout(new GridLayout(2, 1)); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); panelLogin = new JPanel(); panelLogin.setLayout(null); labelUser = new JLabel("Enter UserName"); textFieldUser = new JTextField(10); labelPass = new JLabel("Enter Password"); passwordField = new JPasswordField(10); buttonLogin = new JButton("Login"); clear = new JButton("Cancel"); panelLogin.add(buttonLogin); panelLogin.add(clear); panelLogin.add(labelUser); panelLogin.add(textFieldUser); panelLogin.add(labelPass); panelLogin.add(passwordField); textFieldUser.setBounds(200, 120, 100, 20); labelUser.setBounds(50, 120, 120, 20); labelPass.setBounds(50, 150, 120, 20); passwordField.setBounds(200, 150, 100, 20); buttonLogin.setBounds(70, 180, 100, 20); clear.setBounds(200, 180, 100, 20); buttonLogin.addActionListener(actionEvent); clear.addActionListener(actionEvent); frame.add(panelLogin); //Login frame ends... //Gnereate frame starts here.. panelGnereate = new JPanel(); panelGnereate.setLayout(null); ChangePassword = new JButton("Change Password"); MasterKey = new JButton("Create Master Key"); AppKey = new JButton("Create Application key"); panelGnereate.add(ChangePassword); panelGnereate.add(MasterKey); panelGnereate.add(AppKey); ChangePassword.setBounds(150, 100, 200, 25); MasterKey.setBounds(150, 150, 200, 25); AppKey.setBounds(150, 200, 200, 25); ChangePassword.addActionListener(actionEvent); MasterKey.addActionListener(actionEvent); AppKey.addActionListener(actionEvent); //Gnerate Frame ends here.. //MasterKey Generate Starts Here.. panelMaster = new JPanel(); panelMaster.setLayout(null); UserName = new JLabel("Text"); UserTxt = new JTextField(20); GenerateKey = new JButton("Generate Key"); panelMaster.add(UserName); panelMaster.add(UserTxt); panelMaster.add(GenerateKey); UserName.setBounds(150, 150, 50, 25); UserTxt.setBounds(220, 150, 100, 25); GenerateKey.setBounds(180, 180, 150, 25); GenerateKey.addActionListener(actionEvent); frame.setSize(500, 500); frame.setVisible(true); } public static void main(String args[]) { designUI(); } private static ActionListener actionEvent = new ActionListener() { public void actionPerformed(ActionEvent e) { String action = e.getActionCommand(); if ("Login".equals(action)) { System.out.println("Login action" + e.getActionCommand()); if ("".equals(textFieldUser.getText()) || "".equals(passwordField.getText())) { JOptionPane.showMessageDialog(null, "Enter Both UserName and Password"); } else if ("admin".equals(textFieldUser.getText()) &amp;&amp; "admin".equals(passwordField.getText())) { System.out.println("login value" + textFieldUser.getText() + " " + passwordField.getText()); frame.remove(panelLogin); frame.add(panelGnereate); frame.setVisible(true); } else { JOptionPane.showMessageDialog(null, "Wrong Password"); } } else if ("Cancel".equals(action)) { System.out.println(e.getActionCommand()); System.exit(0); } else if ("Change Password".equals(action)) { } else if ("Create Master Key".equals(action)) { frame.remove(panelGnereate); frame.add(panelMaster); frame.setVisible(true); } else if ("Create Application key".equals(action)) { System.out.println("Message " + UserTxt.getText()); frame.setVisible(false); }else if("Generate Key".equals(action)) { try { new GenerateTxt(UserTxt.getText()); } catch (NoSuchAlgorithmException ex) { Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex); } catch (IllegalBlockSizeException ex) { Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex); } catch (IOException ex) { Logger.getLogger(Login.class.getName()).log(Level.SEVERE, null, ex); } frame.remove(panelMaster); frame.add(panelGnereate); frame.setVisible(true); } } ; }; } </code></pre> <p>It's not working for throughout the process. When I click the master key it showing relevant textbox after clicking genearteKey it showing same panel not the previous one. But when I am moving the mouse over there it is showing the components of the both panels.</p>
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