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Search found 491 results on 20 pages for 'jframe'.

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• NullPointerException Java help

  - by KP65

  Hello guys. I've been tearing my hair out the past few hours trying to solve this problem. Every time I click on a JButton which should open a JFrame(And it does), i get a stacktrace saying I have a null point exception at these bits of code: In class A i have: aButton.addActionListener(new ActionListener() { public void…

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• Trouble adding Image to a JPanel

  - by user1276078

  I'm making a video game, and I need to add an image to a JPanel and then add that JPanel to a JFrame. All of the tutorials I've seen say to add it to a JLabel, but the image needs to be able to move around. Unless you can move a JLabel around, I can't do that. How would I be able to add an Image directly to a JPanel. This is what I…

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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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• How to display a window on top with Java ?

  - by Frank

  I have the following code to display a message : JLabel A_Label=new JLabel("Updating channels ..."); A_Label.setFont(new Font("Times New Roman",0,16)); A_Label.setForeground(Color.BLUE); A_Label.setHorizontalAlignment(SwingConstants.CENTER); JOptionPane pane=new JOptionPane(A_Label); Object[] options=new String[]{"OK"};…

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• Java: Selected rows's index does not changes when I sort them!

  - by adrian7

  Hello, I have a Jtable on which I called the method table1.setAutoCreateRowSorter(true);. So this works on well. But I also have a methos in my JFrame class which is fired when i push a button. It gets the selected rows indexes using this code int selectedRows[] = this.table1.getSelectedRows();. And displays an edit…

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• Drawing multiple lines with Java Swing

  - by rize

  I'm learning drawing lines with Java Swing in order to draw a labyrinth. I can draw one line at a specified position and it shows just fine. But when I want to draw multiple lines, only the last one shows. My code: public class LabyrinthGUI extends JFrame { ... Line line1 = new Line(0, 0, 0, 50);…

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• Flickering when repainting a JPanel inside a JScrollPAne

  - by pR0Ps

  I'm having a problem with repainting a JPanel inside a JScrollPane. Basically, I'm just trying to 'wrap' my existing EditPanel (it originally extended JPanel) into a JScrollPane. It seems that the JPanel updates too often (mass flickering). How would I stop this from happening? I tried using the…

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• How to rotate an image properly in JPanel (Java)

  - by Bruce

  Hi guys, I'm working on rotating a loaded image. I set the graphics on a JPanel and then use standard AffineTransform in order to rotate it, say, 45 degrees. Unfortunately, the image is being cut, if it exceeds the panel area. How may I force JPanel to add scrolls to itself (while loading an…

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• how to display a image in java application after downloading the image

  - by Nubkadiya

  i want to display a image after downloading that image from a web-server i have wrote the code for downloading the image. but i cant set it up to a label or any thing other than jframe (because i want to add more buttons and labels to the GUI). here is the code to download the image from the…

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• improving drawing pythagoras tree

  - by sasquatch90

  Hello. I have written program for drawing pythagoras tree fractal. Can anybody see any way of improving it ? Now it is 120 LOc. I was hoping to shorten it to ~100... import javax.swing.*; import java.util.Scanner; import java.awt.Color; import java.awt.Dimension; import java.awt.Graphics;…

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• Java programming accessing object variables

  - by Haxed

  Helo, there are 3 files, CustomerClient.java, CustomerServer.java and Customer.java PROBLEM: In the CustomerServer.java file, i get an error when I compile the CustomerServer.java at line : System.out.println(a[k].getName()); ERROR: init: deps-jar: Compiling 1 source file to…

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• Creating ActionEvent object for CustomButton in Java

  - by Crystal

  For a hw assignment, we were supposed to create a custom button to get familiar with swing and responding to events. We were also to make this button an event source which confuses me. I have an ArrayList to keep track of listeners that would register to listen to my CustomButton. …

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• java detect clicked buttons

  - by user253530

  I have multiple panels on a JFrame window. I am going to populate each panel differently every time. For example: i start the GUI: (image center panel, right panel, bottom panel). Center panel is populated with 20 buttons, right panel with 10 buttons and bottom panel with 3. second…

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• How to select the specific cell in Jtable?

  - by Nitz

  Hey guys Now in my one jframe i have used two jtables with different data. But now what i want is..as soon as user select one cell on first table, then in second table, the cell next to selected cell of the first table should be selected. means.... if user had selected the cell…

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• Java Swing architecture for flipping through JPane based views

  - by imhotep

  Hi all, I have done a couple of simple swing based apps with static layout, but now I've run into a problem while trying to create an app containing multiple views which are changed by pressing appropriate navigational button. You could compare the idea to a website so that…

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• Java: pass an event to another component

  - by John

  Sorry I don't know if this is very clear, but I'm pretty new to Java. So I have a JFrame with a BorderLayout containing a JPanel and a JButton. What I want to do is when something happens in my JPanel, I want for example change the text of the JButton, or enable/disable…

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• What if I made an explicit reference to 'this' for use inside an inner class?

  - by badp

  So far, I've used this approach to access this from the scope of an inner class: class FooManagementWindow extends JFrame { JButton rejectFoo; //... void getFooAcceptingPanel(){ //... final FooManagementWindow referenceToThis = this; rejectFoo = new…

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• Resizing JPanel to prepare for printing without removing it from its original position

  - by Lesman

  In my program I frequently need to print various JComponents (generally JPanels) and I like them to be full-page. The way I do it now is by using the following code: g2d.scale(pf.getImageableWidth()/componentToPrint.getWidth(),…

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• tiled images in swing

  - by sasquatch90

  I have task to prepare two windows with swing. One contains grid of squares, with random numbers in them. In second I need to load pieces of tiled image and then show them in the correct order, forming tiled image. Windows…

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• How do I synchronize GUI-Elements?

  - by anonymous2500

  Hello, I have a little problem with my java-program. I wanna use Observer, to synchronize two GUIs. But I can't synchronize the JComponent / JButton elements. For example: I have a GUI-Class which implements the…

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• Swing invokeLater never shows up, invokeAndWait throws error. What can I do?

  - by Geo

  I have this code: try { SwingUtilities.invokeAndWait(new Runnable() { public void run() { try { dialog.handleDownload(); } catch (IOException io) { …

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• Java ServerSocketChannel SocketChannel (Callback)

  - by ikurtz

  I am trying to learn Java. I would like to implement a simple networked connect 4 game as well as a chat feature. I want my network logic to be non blocking so after much study I found that…

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• How do I make my applet turn the user's input into an integer and compare it to the computer's random number?

  - by Kitteran

  I'm in beginning programming and I don't fully understand applets yet. However, (with some help from internet tutorials) I was able to create an applet that plays a game of guess with the…

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• More swing design & actions

  - by takoi

  Im pretty new to gui programming so i've been reading through every post on this site about swing and design. Whats been answered over and over again is that one should have a class which…

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• Web applet game design

  - by Vlad

  I making web games in java and having troubles each time when getting to the GUI design, usually I'm looking at others codes and copy most of the design, and I can't decide which design…

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