Create Jpanel and buttons at run time

java_create_remove_jpanel_at_runtime.java

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class JavaApplication7 extends JFrame
{
    JPanel panel;
    List<JPanel> components = new ArrayList<JPanel>();

public JavaApplication7()
{

 setLayout(new BorderLayout());
 panel=new JPanel();
 panel.setLayout(new FlowLayout());
 add(panel,BorderLayout.CENTER);
 JPanel answer = new JPanel();
 JButton jbminus = new JButton("-");
 jbminus.setEnabled(false);
 JButton jbplus  = new JButton("+");
 JTextField jtext = new JTextField("test");
 answer.add(jbminus);
 answer.add(jbplus);
 answer.add(jtext);
 panel.add(answer);
 components.add(answer);
 jbplus.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent ae) {
                    JPanel answer = new JPanel();
    
                    JButton jbminus = new JButton("-");
                    //JButton jbminus = new JButton(ICon);
                    JButton jbplus  = new JButton("+");
                    
                    JTextField jtext = new JTextField("test");
                    
                    answer.add(jbminus);
                    answer.add(jbplus);
                    answer.add(jtext);
                    
                    jbminus.addActionListener(new ActionListener() {

                    @Override
                    public void actionPerformed(ActionEvent ae) {
                        if (components.contains(((JButton)ae.getSource()).getParent()) == true)
                        {// in list
                            components.remove(((JButton)ae.getSource()).getParent());
                            ((JButton)ae.getSource()).getParent().getParent().remove(((JButton)ae.getSource()).getParent());
                            panel.revalidate();
                            panel.validate();
                            panel.repaint();
                        }
                        
                    }
                    
                });
                    
                    jbplus.addActionListener(this);
                    components.add(answer);
                    panel.removeAll();
                    for(int i=0;i<components.size();i++){
                        panel.add(components.get(i));
                    }
                    panel.revalidate();
                    panel.validate();
                    panel.repaint();

            }
        });
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 setSize(500,500);
 setVisible(true);
}

public static void main(String[]args)
{
 JavaApplication7 acojfar=new JavaApplication7();
}
}