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Search found 428 results on 18 pages for 'jpanel'.

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• JTabbedPane: only first tab is drawn, the second is always empty (newbie Q)

  - by paul

  I created a very simple JTabbedPane by first creating an empty JTabbedPane object, then 2 JPanels that I later add. Each JPanel is holding a object that extends JButton and implements MouseListener. Each of these holds a different image loaded from a file; the image is held locally as a buffered image and as an image icon, etc., all of which works…

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• Swing layout with miglayout and nested panels

  - by Jazzepi

  I have a Swing program using SwingLayout. The structure of the Swing components looks like this. JFrame JPanel (Cardlayout) JPanel (Miglayout) - Main panel Jpanel (Flowlayout) - Checkbox Panel JPanel (Flowlayout) - Option Panel My problem right now is that I'm not sure how to prevent the checkbox panel from…

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• Java Swing NullPointerException when drawing

  - by juFo

  I'm using a custom JLayeredPane. I have several Shapes which needed to be drawn on different layers in the JLayeredPane. To test this I create a JPanel and ask its graphics. Then I draw a test rectangle on that JPanel (preparing the graphics) and in my paintComponent method from the JLayeredPane I finally draw everything. But this fails…

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• ActionListener problem

  - by thegamer

  Hello, i am trying to make an actionListener on a button in another button which has also an actionlistener and i just couldn't figure it out for some way. I am trying to make an action on the 2nd button but i couldn't figure it out.If anyone helps me i'd appreciate! here is the code below: import java.awt.; import java.awt.event.; …

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• Problem to focus JTextField

  - by Tom Brito

  I have used the approach of the ComponentListener to call focus in JTextField within a dialog, but for this case is just not working, I don't know why. It shows the focus in the text field and fast change to the button. Run and see: import java.awt.Component; import java.awt.GridLayout; import java.awt.event.ComponentEvent; import…

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• Problem with setVisible (true)

  - by Jessy

  The two examples shown below are same. Both are supposed to produce same result e.g. generate the coordinates of images displayed on JPanel. Example 1, works perfectly (print the coordinates of images), however example 2 returning 0 for the coordinate. I was wondering why because, I have put the setvisible (true) after adding the…

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• java gui changing picture causes heapspace error

  - by pie154

  I have a java programme than when a button is clicked it updates the image on screen to the according image. this will work for the first 15 or so clicks then it causes a java heapspace error. I think it is because of the way I am updating the jpanel that contains the bufferedimage but not sure what the reason is. My code to get…

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• Why a EDT violation happens?

  - by Roman

  I started to use CheckThreadViolationRepaintManager to detect EDT violations. It complains about: partner = getParameter("partner",generatePartnerSelectionPanel(),Design.partnerSelectionDuration); Because it does not like generatePartnerSelectionPanel() because it does not like JPanel panel = new JPanel(); in this method.…

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• How I can get output from 1st frame textfield input text to 2nd frame textArea

  - by soulgreen

  Here is my 1st frame - I want went I input text in textfield example name then click button report will display output to 2nd frame using textArea... please help me import java.awt.; import java.awt.event.; import javax.swing.; import javax.swing.border.; public class Order extends JFrame implements ActionListener { private…

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• Java Stopping JApplet Components from Resizing based on Applet Size

  - by Doug

  Creating a JApplet I have 2 Text Fields, a button and a Text Area. private JPanel addressEntryPanel = new JPanel(new GridLayout(1,3)); private JPanel outputPanel = new JPanel(new GridLayout(1,1)); private JTextField serverTf = new JTextField(""); private JTextField pageTf = new JTextField(""); private JTextArea outputTa = new…

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• update jframe in java or revalidate/repaint/ panel

  - by user1516251

  How to update a java frame with changed content I want to update a frame or just the panel with updated content. What do I use for this Here is where i want to revalidate the frame or repaint mainpanel or whatever will work I have tried a number of things, but none of them have worked. public void…

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• setting something disposed or invisible java

  - by OVERTONE

  this might be simple enough as just inserting the right method but i cant seem to get it right. i have a simple program with two buttons. each one changes the picture above them. but anytime i click the buttons i get some odd awt event queue error. i think its because im trying to add something to a…

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• Java swing doesn't show changes to source

  - by out_sider

  I'm using Java Swing graphical editor with netbeans to make my project...but using it brings some limitations like I can't add to a jpanel an image,using java swing options. So i'll need to code it, implementing a new jPanel. My problem is that the code generated by the java swing graphical editor…

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• Line up swing components by edges

  - by rasen58

  Is it possible to line up swing components? The components are in separate panels which both use flow layout. These two panels are in another panel which is using a grid layout. As you can see there is a subtle difference and I find it annoying. I know that all of the jlabels [the rectangles in…

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• Swing: easiest way to align width of [dynamic][static][dynamic] components?

  - by java.is.for.desktop

  What is the easiest way in standard Java Swing to align three components in such a way that: the dynamic widths of Component1 and Component3 are adjusted to be equal, while Component2 (which is in between) has constant width? Imagine we have some resizable JPanel (such as inside a JFrame). …

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• Error Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException [migrated]

  - by user134212

  I'm new here. I'm learning how to program on java and I have a problem with my code. I really have no clue why my code is not working. I think my mistake may be here, but I'm not quite sure. m3 = new Matriz(ren2,col2); btSumar.addActionListener(new ActionListener() { …

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• problem in login in yahoo massanger

  - by khoyendra

  package session; import java.io.FileWriter; import java.text.DateFormat; import java.text.SimpleDateFormat; import javax.swing.JOptionPane; import org.openymsg.network.FireEvent; import org.openymsg.network.Session; import org.openymsg.network.SessionState; import…

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• Panel is not displaying in JFrame

  - by mallikarjun

  I created a chat panel and added to Jframe but the panel is not displaying. But my sop in the chat panel are displaying in the console. Any one please let me know what could be the problem My Frame public class MyFrame extends JFrame { MyPanel chatClient; …

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• Problem with sending out variable to serial port using api JAVA

  - by sjaakensjon

  We are developing a java program for school. But we are experiencing problems with sending out a variable created by 3 sliders. The idea is that we have 3 sliders. One slider for every color. Red green and blue. The variable has to have a value between 0 and…

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• background in JAVA [closed]

  - by leen.zd

  how can i put a background image in my java code? this is my code... what's error? import java.awt.Container; import java.awt.Dimension; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import…

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• Why keylistener is not working here?

  - by swift

  i have implemented keylistener interface and implemented all the needed methods but when i press the key nothing happens here, why? package swing; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics; import…

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• Background image in a JFrame.

  - by thepandaatemyface

  Hi, This question has been asked a lot but everywhere the answers fall short. I can get a JFrame to display a background image just fine by extending JPanel and overriding paintComponent, like so: class BackgroundPanel extends JPanel { …

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• How do I properly display all content in a JTabbedPane?

  - by maleki

  I am nesting a JPanel inside a JTabbedPane. I am having trouble displaying all the content inside of the JTabbedPane. The outside borders of the internal content get chopped off. I am currently not using a Layout Manager for my JTabbedPane…

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• Why setPreferredSize does not change the size of the button?

  - by Roman

  Here is the code: import javax.swing.*; import java.awt.event.*; import java.awt.*; public class TestGrid { public static void main(String[] args) { JFrame frame = new JFrame("Colored Trails"); …

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• JFrame that has multiple layers

  - by phunehehe

  Hello, I have a window that has two layers: a static background and a foreground that contains moving objects. My idea is to draw the background just once (because it's not going to change), so I make the changing…

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