Why I cannot add a JPanel to JFrame?
- by Roman
Here is the code:
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.event.*;
import java.awt.*;
public class GameWindow {
private String[] players;
private JFrame frame;
// Constructor.
public GameWindow(String[] players) {
this.players = players;
}
// Start the window in the EDT.
public void start() {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
showWindow();
controller.start();
}
});
}
// Defines the general properties of and starts the window.
public void showWindow() {
frame = new JFrame("Game");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(600,400);
frame.setVisible(true);
}
// The thread controlling changes of panels in the main window.
private Thread controller = new Thread() {
public void run() {
frame.add(generatePartnerSelectionPanel());
frame.invalidate();
frame.validate();
}
};
// Generate the panel for the selection of a partner.
private JPanel generatePartnerSelectionPanel() {
JPanel panel = new JPanel();
panel.add(new JLabel("Pleas select a partner:"));
return panel;
}
}
I should see "Pleas select the partner" and I don't. Why?
I suppose that it's because I do not see frame from the run method of the Thread.
