Automatic placement of components on to the JFrame.

Question

Hello I want to know if it is possible to have a button in my program and when this button is pressed by the user it automatically places about 3 JFormattedtextfields on to the JFrame? If so how do I go about writing code for this?

Answer 1

Well I am trying to have a check box so that only selected components are deleted. At the moment I am trying to item listener to the check box. I had a look at the checkbox demo and I did the exact same thing but mine does'nt seem to work I don't want to proceed with the remove clients method before this is sorted out. Can someone please point out my mistake to me and suggest ways to correct it.
import net.miginfocom.swing.MigLayout;
import javax.swing.*;*
*import java.awt.event.*;
public class LayOut {
//Labels to identify the fields
JLabel currentLabel = new JLabel("Current");
JLabel systemVoltageLabel = new JLabel ("Voltage");
JLabel kVALabel = new JLabel ("KVA");
//The button
JButton addClients = new JButton("Add Clients");
JButton removeClients = new JButton("Remove Clients");
// the panel
JPanel mainPanel = new JPanel();
// the JFrame
JFrame frame = new JFrame("Runtime test software");
public LayOut() {
mainPanel.setLayout(new MigLayout());
mainPanel.add(addClients, "wrap");
addClients.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addClients();
removeClients.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
removeClients();
frame.add(mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500,500);
frame.setVisible(true);
public void addClients() {
mainPanel.add(new JCheckBox());
mainPanel.add(new JFormattedTextField(),"width 20:80");
mainPanel.add(new JFormattedTextField(),"gapleft 30, width 20:80");
mainPanel.add(new JFormattedTextField(),"gapleft 30, width 20:80, wrap");
mainPanel.revalidate();
mainPanel.validate();
public void removeClients() {
JCheckBox.addItemListener(this); // this is how it is done in the check box tutorial
mainPanel.revalidate();
mainPanel.validate();
public static void main(String[] args) {
LayOut l;
l = new LayOut();
}