jpanel

I am learning about JPanel and GridLayout , this snippet of code will produce a simple JPanel with 6 buttons package testing; import java.io.*; import java.util.*; import java.security.*; import javax.xml.bind.DatatypeConverter; import java.lang.*; import java.awt.*; import javax.swing.*; public class Testing { public static class GridPanel extends JPanel { public GridPanel() { setLayout(new GridLayout(2,3)); setBackground(Color.GREEN); this.setPreferredSize(new Dimension(500,500)); JButton b1 = new JButton ("Button 1"); JButton b2 = new JButton ("Button 2"); JButton b3 = new JButton ("Button

Are there some rules, or good/bad experiences with AncestorListener , ComponentListener or HierarchyListener listening for visibility of changes with JPanel and JComponents ? Is one of them better or safer than the others? I would especially like to know about when and how JPanel / JComponent is hidden. Notice the following code contains incorrect Swing rules, like using Thread.sleep(int) , in this case, to allow me to print-out correct order of Listeners in Swing GUI import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.event.ComponentEvent; import java.awt.event

I'm working on a game in which I need to 'hit' a mouse/rat, it will disappear and you'll get 1 point. I made it randomly appear everytime i start the app, but I want the image te be drawn randomly every x seconds using Timer() or something. My code for the game screen looks like this: import java.awt.Color; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Font; import java.awt.Graphics; import java.awt.Image; import java.awt.Point; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Random; import javax.swing

I'm working on a project in which I am trying to make a paint program. So far I've used Netbeans to create a GUI and set up the program. As of right now I am able to call all the coordinated necessary to draw inside it but I am very confused with how to actually paint inside it. Towards the end of my code I have a failed attempt at drawing inside the panel. Can anyone explain/show how to use graphics in a example like this? All examples I have found make a class and extend it with JPanel but I don't know if I can do this since it was generated in netbeans. I need to draw inside a JPanel ,

I'm trying to improve my understanding of Java, particularly Java GUI, by making a puzzle program. Currently the user selects an image, which is cut up into a specified number of pieces. The pieces are drawn randomly to the screen but they seem to be covered by blank portions of other pieces, and not all of them show up, but I can print out all the coordinates. I am using absolute positioning because a LayoutManager didn't seem to work. I briefly tried layeredPanes but they confused me and didn't seem to solve the problem. I would really appreciate some help. Here are the 2 relevant classes:

I've got 3 windows in 3 separate classes and I would like to use cardLayout so that when you click the next button, the next window will appear. How do I add JPanels containing different elements to one cardLayout? This is the first window: (the only difference is the background though - but it represents the idea of how I got it actually) public class Window1 extends JPanel implements ActionListener { static CardLayout cardLayout = new CardLayout(); public Window1() { init(); } private void init() { JPanel jp = new JPanel(new BorderLayout()); JPanel jp2 = new Window2(); //JPanel jp3 = new