jpanel

After learning that dispose() should be called on Graphics / Graphics2D object after use, I went about changing my game to incorporate this. When I added g2d.dispose() in overridden paintComponent(Graphics g) of JPanel , my components which I added (extensions of JLabel class) where not rendered I was able to still click on them etc but they would not be painted . I tested with a normal JLabel and JButton with same effect (though JButton is rendered when mouse is over it). So my question is why does this happen? Here is an SSCCE to demonstrate: after uncommenting call to dispose() in

For a JLabel with icon, if you setHorizontalTextPosition(SwingConstants.LEADING) , the icon is painted right after text, no matter how wide the label is. This is particularly bad for a list, as the icons would be all over the place depending on how long the text is for each item. I traced the code and it seems to be that in SwingUtilities#layoutCompoundLabelImpl , text width is simply set to SwingUtilities2.stringWidth(c, fm, text) , and icon x is set to follow text without considering label width. Here is the simplest case: import java.awt.*; import javax.swing.*; public class TestJLabelIcon

I am working on a Java project to simulate the flight of a helicopter in a frame. The helicopter moves on the screen using the arrow keys. I want the helicopter to be able to move infinitely, that is, when the helicopter reaches the edge of the frame, the background should move in the opposite direction to have the effect of endless terrain. Here is the code I have so far: import java.awt.Graphics; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.image.BufferedImage; import java.net.URL; import java.io.IOException; import javax.imageio.ImageIO; import javax

This is a follow-up to my previous question. I've simplified things as much as I could, and it still doesn't work! Although the good thing I got around using getGraphics() . A detailed explanation on what goes wrong here is massively appreciated. My suspicion is that something's wrong with the the way I used addMouseListener() method here. EDIT completely rewrote the code. Still does not work properly though. import java.awt.Color; import java.awt.Graphics; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import javax.swing

I have a JFrame. This JFrame contains a JButton. I click the JButton and 10 JTextFields are created. the problem: I cannot see them until "I force a repaint()" by resizing the window. Only then do I see the JTextFields created. CODE: JPanel points = new JPanel(); //Creating the JTextFields: for (int i=0; i<10; i++) { JTextField textField = new JTextField(); points.add(textField); } repaint(); this.repaint(); super.repaint(); points.repaint(); THANK YOU - after the for loop, I just called points.validate() and it worked... Tom Hawtin - tackline Container.add API docs sayeth: Note: If a