jpanel

I am trying to add the mouse actions to my panel. This is what the program is supposed to do: Write a program that allows the user to specify a triangle with three mouse presses. After the first mouse press, draw a small dot. After the second mouse press, draw a line joining the first two points. After the third mouse press, draw the entire triangle. The fourth mouse press erases the old triangle and starts a new one. I would strongly recommend you start by having a read through How to Write a Mouse Listener . When ever you get stuck, these tutorials (and the JavaDocs) are the best place to

I have got one J Frame that includes 2 panels , I was able to switch between them using Visible but I want them to appear in the same position and the same size the other was in. Use a CardLayout to swap JPanels. The tutorial can be found here: CardLayout tutorial . When you do this, you will need a JPanel to be set to use the CardLayout and which will hold your other two JPanels. You will need to add these JPanels to the CardLayout using JPanel with String constants, so that the CardLayout will be able to identify the views with a String. For instance: CardLayout cardLayout = new CardLayout()

When I click on the button that activates the file chooser, and add the resulting file the panel color disappears. Does anyone know why this is happening? import javax.swing.JPanel; import javax.swing.JButton; import javax.swing.JLabel; import java.awt.Component; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.IOException; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.filechooser.FileSystemView; import javax.swing.JFileChooser; import javax.swing.plaf.FileChooserUI;

I have a JPanel in my java code and I want to set its size, I have used JPanel.setSize(500,500); and JPanel.setSize(new Dimension(500,500)); but both are not working. Please tell how I can set the size of JPanel? Most Swing layout managers respect a component's preferredSize and not its size. You could call setPreferredSize(new Dimension(500, 500)) , but this can be overridden later in your code, and can lead to an inflexible GUI. Better to override the JPanel's getPreferredSize() method and return a calculated Dimension that works best in all situations. For example: import java.awt.Color;

I was wondering what went wrong. I've done this before but for some reason I can't get this to work this time. I designed the project in Netbeans. The most relevant part is the method initTiras, which is suppossed to draw something, but it doesn't. I included the code generated by NetBeans. Here's the most simplified version of the code, and still it paints nothing. So I created a new Frame in the proyect. Then I put a JPanel in it (in desing mode). The JPanel's called ElPanel and the JFrame LaFrame. Here's the main class: package ElPackage; public class Resistores { public static void main

My code is basically about having a frame and it has a button. You press the button you can draw rectangles, getting coordinates from the mouse press and the mouse release. Now, if you remove the button the code works perfectly, here is the code. //testing file package ActionTest; import java.awt.*; import javax.swing.*; public class MouseTest { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { JFrame frame = new MouseFrame(); frame.setTitle("MouseTest"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); frame