java - How would I dynamically add swing component to gui on click?

Question

What I am looking to do is a similar principle to adding attachments to emails, you can click a button and a new browse box would open increasing the number of separate attachments you can have.

I'm fairly new so if someone could point me towards an example?

Answer 1

Sample code to add Buttons on the fly dynamically.

panel.add(new JButton("Button")); validate(); 

Full code:

import javax.swing.JFrame; import javax.swing.JButton; import javax.swing.JPanel;  import java.awt.event.ActionEvent; import java.awt.event.ActionListener;  import java.awt.FlowLayout; import java.awt.BorderLayout;  public class AddComponentOnJFrameAtRuntime extends JFrame implements ActionListener {      JPanel panel;      public AddComponentOnJFrameAtRuntime() {         super("Add component on JFrame at runtime");         setLayout(new BorderLayout());         this.panel = new JPanel();         this.panel.setLayout(new FlowLayout());         add(panel, BorderLayout.CENTER);         JButton button = new JButton("CLICK HERE");         add(button, BorderLayout.SOUTH);         button.addActionListener(this);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         setSize(500, 500);         setVisible(true);     }      public void actionPerformed(ActionEvent evt) {         this.panel.add(new JButton("Button"));         this.panel.revalidate();         validate();     }      public static void main(String[] args) {         AddComponentOnJFrameAtRuntime acojfar = new AddComponentOnJFrameAtRuntime();     } } 

• Resource

Answer 2

public static void main(String[] args) {      final JFrame frame = new JFrame("Test");     frame.setLayout(new GridLayout(0, 1));      frame.add(new JButton(new AbstractAction("Click to add") {         @Override         public void actionPerformed(ActionEvent e) {              SwingUtilities.invokeLater(new Runnable() {                 @Override                 public void run() {                     frame.add(new JLabel("Bla"));                     frame.validate();                     frame.repaint();                 }             });         }     }));      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     frame.setSize(400, 300);     frame.setVisible(true); } 

Answer 3

Component was not visible until setSize() was called:

component.setSize(100,200);
jPanel.add(component);
jPanel.revalidate();
jPanel.repaint();