如何在Java中运行时添加JTextField？

Question

In order to develop a edit text in java for study. I'm with a problem: My program once opened by the user, if the user to click in button "Search", then the ActionListener will add a field in Jpanel.

For example: I have a class JToolBar that sets up jtoolbar menu that extends JPanel. Then, I add it in JFrame . Within that JToolbar there's a button "Search", if the user to click at this button, a JTextField will appears side this menu instantly.

I try to create a class private within that JToolBar class. So, I just add the JTextField to JPanel contains the JToolbar . However, is not working. There's no error. Simply not appears the JTextField . What I do to solve that problem ?

Answer 1

When you add a component to a visible GUI the general code is:

panel.add(...);
panel.revalidate();
panel.repaint();  // sometimes needed

You need the revalidate() to tell the layout manager that a component has been added.