How to create Restaurant Management Systems in Java NetBeans using If Statement, JFrame JTextBox, JLabel, Buttons, and checkBox

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Use the following lines of codes for Exit:

private JFrame frame;
private void jbtnExitActionPerformed(java.awt.event.ActionEvent evt) {

frame = new JFrame("Exit");
if (JOptionPane.showConfirmDialog(frame, "Confirm if you want to exit", "Student Result System",
JOptionPane.YES_NO_OPTION)== JOptionPane.YES_NO_OPTION){
System.exit(0);
}
}