How to reload a JPanel?

Question

I'm a java newbie... I need to know how to reload a JPanel? I extended the JPanel class and created a panel that will run in a cardlayout in an Applet. I want this panel to reload/refresh after the user clicks a button in this panel. I tried including the revalidate() and repaint() methods (methods I don't understand well) in the ActionListener for the button but nothing happened. Can anyone throw some light on how to correctly refresh the whole panel?

Yogh

please whats is reload, for better help sooner post an SSCCE, short, runnable, compilable – Tacitus

What do you mean by "reload" and "refresh" exactly? Show some code, explain with an example what you want to do. – Shortcircuit

refresh/reload/update all the components in the panel... some of the components are displaying info that is being updated through jdbc – Yogh

you should just use the Graphics instance of the JPanel. – Hydroplane

Let's take a JLabel for example, whose text is reloaded from the database. To make it display the new text, use label.setText(). For a JTable, use table.setModel(), or update the data in its model. For a JTextArea, setText(), etc. – Shortcircuit

@Manish Doshi s/he want to setText based on value from JDBC, then Graphics haven't something with – Tacitus

@user2108393 : If you are looking for something like, an event that can clear all the fields and other components of their previous values, you can have a look at this example, hopefully this might be of some help. – Pizarro

Answer 1

This works fine for me. But after an other

_panel.revalidate();
_panel.repaint();

Prud

first removeAll() to remove all components _panel.removeAll(); _panel.revalidate(); _panel.repaint(); – Vinosity

Answer 2

You could also refresh the entire JFrame to update every component, and not just the panel and its components:

this.revalidate();

this being the instance of your JFrame, if your class extends JFrame, just use this.

Aliber