Java-Buddy

This example show add and remove UI compnents in run-time dynamically:

package javadynui;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaDynUI extends JFrame {
 static JavaDynUI myFrame;
 static int countMe = 0;
 JPanel mainPanel;
 public static void main(String[] args) {
 SwingUtilities.invokeLater(() -> {
 createAndShowGUI();
 });
 }
 private static void createAndShowGUI() {
 myFrame = new JavaDynUI();
 myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 myFrame.prepareUI();
 myFrame.pack();
 myFrame.setVisible(true);
 }
 private void prepareUI() {
 mainPanel = new JPanel();
 mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
 JButton buttonAdd = new JButton("Add subPanel");
 buttonAdd.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 mainPanel.add(new subPanel());
 myFrame.pack();
 }
 });
 
 JButton buttonRemoveAll = new JButton("Remove All");
 buttonRemoveAll.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 mainPanel.removeAll();
 myFrame.pack();
 }
 });
 getContentPane().add(mainPanel, BorderLayout.CENTER);
 getContentPane().add(buttonAdd, BorderLayout.PAGE_START);
 getContentPane().add(buttonRemoveAll, BorderLayout.PAGE_END);
 }
 private class subPanel extends JPanel {
 
 subPanel me;
 public subPanel() {
 super();
 me = this;
 JLabel myLabel = new JLabel("Hello subPanel(): " + countMe++);
 add(myLabel);
 JButton myButtonRemoveMe = new JButton("remove me");
 myButtonRemoveMe.addActionListener(new ActionListener(){
 @Override
 public void actionPerformed(ActionEvent e) {
 me.getParent().remove(me);
 myFrame.pack();
 }
 });
 add(myButtonRemoveMe);
 }
 }
}

[フレーム]