Questions in Java Swing

How to have an Intenal Frame in diffrent file and the how to call them in a JFrame using JTree
Please email me to [email protected]

Please email me to [email protected]
post it here, read it here.
I hope the spambots don't get hold of your email address
[email protected]
if they do, then
[email protected]
might get flooded with spam, and then the webmaster of
[email protected]
wouldn't be too happy.
the more times you post your email address:
[email protected]
the more times the bots are likely to read
[email protected]
so, in future, better not to post your email address
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Similar Messages

Question to java Swing Team.create Theme for WindowsLookAndFeel

hi
i have a java swing application , and its look and feel is WindowsLookAndFeel(i am currently using xp), i need to set the theme for WindowsLookAndFeel. as i have seen there is no API to set the theme in WindowsLookAndFeel but there is for MetalLookAndFeel,
Is there any way to do it.

Well, the problem is that you can't expect a Java application to reconfigure the operating system (to set its theme), and Java has no easy way of finding out what themes are on a Windows system or retrieving Windows theme information.
Now, you can attempt to mess with the AWT properties controlling the way in which the WindowsLookAndFeel is drawn, and those are set at invocation from the OS (and updated whenever the Windows theme, at least, changes). Try looking at Toolkit.get/setDesktopProperty().

Question about java swing

I was playing around with the code given in the swing tutorial by Java. It has this
frame.getContentPane().add(label);I was looking at it and decided to delete the getContentPane to see what it did. The program still worked fine and I was wondering is the getContentPane necessary?
Also I wanted the program to print 2 statements instead of one they had
JLabel label = new JLabel("Hello World");
frame.getContentPane().add(label);and I changed it too
JLabel label = new JLabel("Hello World");
JLabel label1 = new JLabel("Hi World");
frame.getContentPane().add(label);
frame.getContentPane().add(label1);And instead of printing 2 statements "Hi world" replaces "Hello World" what am I doing wrong?

I was looking at it and decided to delete the getContentPane to see what it did. The
program still worked fine and I was wondering is the getContentPane necessary?No, it's not. Have a look at the section of the Tutorial dealing with "Using Top Level Containers" - http://java.sun.com/docs/books/tutorial/uiswing/components/toplevel.html Especially the note following "Adding Components to the Content Pane".

What is difference between C# Gzip and Java swing GZIPOutputStream?

Hi All,
I have a Java swing tool where i can compress file inputs and we have C# tool.
I am using GZIPOutputStream to compress the stream .
I found the difference between C# and Java Gzip compression while a compressing a file (temp.gif ) -
After Compression of temp.gif file in C# - compressed file size increased
while in java i found a 2% percentage of compression of data.
Could you please tell me , can i achieve same output in Java as compared to C# using GZIPOutputStream ?
Thank a lot in advance.

797957 wrote:
Does java provides a better compression than C#?no idea, i don't do c# programming. and, your question is most likely really: "does java default to a higher compression level than c#".
Btw what is faster compression vs. better compression?meaning, does the code spend more time/effort trying to compress the data (slower but better compression) or less time/effort trying to compress the data (faster but worse compression). most compression algorithms allow you to control this tradeoff depending on whether you care more about cpu time or disk/memory space.

Certificate support in Java Swing application

Hi There,
I am new to this Certificate thing and running into issues! Would appreciate for all the help and please ignore for any stupid questions.
Here is my scenario.
1. I do have a client server application and client is a java swing application which connects to a Server application (Using Jetty 4.2.22 as embedded server)
2. Initially, it had a self signed certificate but goal is to support third party certificate (i.e import in the server and then show warning to the client during login)
If somebody has already done this or point me to some example (using Jetty APIs) that would be great help. If not, here is what I am trying to do and some questions.
1. I tried to get some free SSL certificate from the web and imported into the server's KeyStore.
If I do a list from the server using Keystore, this is what it looks like
keytool -list -keystore /tmp/keystore -storepass genview
Keystore type: JKS
Keystore provider: SUN
Your keystore contains 2 entries
self, Dec 3, 2008, PrivateKeyEntry,
Certificate fingerprint (MD5): 0D:58:E8:77:89:09:F8:2B:37:64:37:D5:03:AD:C9:0B
rapid, Jan 6, 2009, trustedCertEntry,
Certificate fingerprint (MD5): 64:9C:EF:2E:44:FC:C6:8F:52:07:D0:51:73:8F:CB:3
QUESTION 1 : why the third party certificate's entry as "trustedCertEntry"? Is it always like this? Do I need to have only one certificate at a time? (If so, just remove the self signed and have 3rd party one)
My Jetty server comes up but when I connect from Client Swing App, the "getServerCertificates()" method only returns one entry i.e self signed one but not the third party one.
I am using like this
URL url = new URL("https://127.0.0.1:port");
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
conn.connect();
Certificate[] certs = conn.getServerCertificates();
Is not this API supposed to return all the server's certificate?
Please guide me or instruct me what to do.
Thanks,
CRB

Crossposted and answered.

Loading large files in Java Swing GUI

Hello Everyone!
I am trying to load large files(more then 70 MB of xml text) in a Java Swing GUI. I tried several approaches,
1)Byte based loading whith a loop similar to
pane.setText("");
             InputStream file_reader = new BufferedInputStream(new FileInputStream
                       (file));
             int BUFFER_SIZE = 4096;
             byte[] buffer = new byte[BUFFER_SIZE];
             int bytesRead;
             String line;
             while ((bytesRead = file_reader.read(buffer, 0, BUFFER_SIZE)) != -1)
                  line = new String(buffer, 0, bytesRead);
                  pane.append(line);
             }But this is gives me unacceptable response times for large files and runs out of Java Heap memory.
2) I read in several places that I could load only small chunks of the file at a time and when the user scrolls upwards or downwards the next/previous chunk is loaded , to achieve this I am guessing extensive manipulation for the ScrollBar in the JScrollPane will be needed or adding an external JScrollBar perhaps? Can anyone provide sample code for that approach? (Putting in mind that I am writting code for an editor so I will be needing to interact via clicks and mouse wheel roatation and keyboard buttons and so on...)
If anyone can help me, post sample code or point me to useful links that deal with this issue or with writting code for editors in general I would be very grateful.
Thank you in advance.

Hi,
I'm replying to your question from another thread.
To handle large files I used the new IO libary. I'm trying to remember off the top of my head but the classes involved were the RandomAccessFile, FileChannel and MappedByteBuffer. The MappedByteBuffer was the best way for me to read and write to the file.
When opening the file I had to scan through the contents of the file using a swing worker thread and progress monitor. Whilst doing this I indexed the file into managable chunks. I also created a cache to further optimise file access.
In all it worked really well and I was suprised by the performance of the new IO libraries. I remember loading 1GB files and whilst having to wait a few seconds to perform the indexing you wouldn't know that the data for the JList was being retrieved from a file whilst the application was running.
Good Luck,
Martin.

Help with java swing

Hi people!i need some help
Im a new user for java programming language.Well im programming an application using java swing libraries. I have some problems trying to accesing variables from those swing Jpanels. Ill make it clear....
Im using Netbeans...
I have a class for the window (a JFrame) including 2 Jtextfields and 2 Jlabels
import .......
public class myclass extends javax.swing.JFrame{
public double gp;
public double gv;
public G() {
initComponents();
gpnom=this.gpnom;
gvnom=this.gvnom;
private void TXFgpnom(java.awt.event.ActionEvent evt) { //TXField
gpnom= Double.parseDouble(TXFgpnom.getText());
gvnom= Double.parseDouble(TXFgvnom.getText());
.......//theres a lot of more code .for listeners..next...
Now ive created a new file (a new class)in the same package ,but i cant access public variables from swing class
//the next class was created in a new file
public class hi () {
JPanel prin =(JPanel) new myclass().getContentPane(); //ok
double number=gpnom // error variable not found
When i try to get the value of "number" ...i always get "ERROR" And the class for that textfield was public..i think...
HOw can i use variables from that Jpanel?
Id appreciate an answer...
thanx for your help!
Paco

In future Swing related questions should be posted in the Swing forum and camickr will be more likely to answer if you have used code tags to properly format your code.
Luckily this problem does not seem to be Swing related in the least because the public variables you have in your other class are named gp and gv and further when you access public variables (or properties) of a class you must access them by an instance of that class. Which you don't appear to be doing either.

Changeing to mouse floatable in java swing object

Hi All
I want change to my select mouse floatable swing object functionality in java swing Application. If it mouse over functionality window or Frame based application. If anybody feel easy sloution that ,plz help solve this problem.
Thanx to Advance.
Bye
ARjun...

select mouse floatable swing object"huh?
If it mouse over functionality window or Frame based application.double huh?
be a little more clear..i don't think anyone here understand what you're asking for.
here's my take on your question (guess).
Are you asking for dockable Panel and component?
ie)
you have a create JComponent that is added to a JFrame, etc..
When the user move the mouse over the component, and perform a mouse press, you want to allow the user to move the component to another location (the component is dockable??)
There are severals Dockable panel and compoent out there for free..so i suggest that you would use them ; rather than writing your own.

Java swing tree view interact with indesign javascript

i have java swing tree view(program).if i execute my program it will all indesign script folder files in tree view. what is my problem is if i click the script
i want to execute. is it possible to execute indesign javascrpt from java swing UI. could anyone tell me pls.

Sorry if I did not make this clear:
This is not an InDesign issue but a Java issue. Search, or ask in a Java forum for best practice to deal with the mentioned platform specific mechanisms:
- inter process communication (AppleEvent or TLB/OLE )
- command line / shell script invokation
- a way to launch an JSX script - the equivalent mechanism to File.execute() in Extendscript.
For example, if I ask Google for "Java TLB", the second hit takes me to:
http://dev.eclipse.org/newslists/news.eclipse.tools/msg09883.html
Eventually you can reuse the DLL and jar - I haven't read that far.
Google for Java AppleEvent:
http://developer.apple.com/samplecode/AppleEvent_Send_and_Receive/listing2.html
Note the 1999 copyright, this is pre-OSX. Also located in a "legacy documents" area. Apple has the bad habit to deprecate/abandon most of their technology every other year, so I would not be surprised if it does not work any more and you'd have to write you own JNI, JDirect or JNIDirect glue ( I don't even know the current buzzword). Ah, further digging unveiled that they even dropped the successor which was named "CocoaJava".
If Mac specific, maybe post your questions to this list: http://lists.apple.com/mailman/listinfo/java-dev
Dirk

File diplay concept in java swing

i want to display pdf page and xml page in java swing.
whether it is possible.
pls help

well i cant understand ur question first.
if u just wanna display them just as text files just create a text area and use the setText() method and write all the documents content into it(i assume u know how to read a file using streams)
i dont know whether it will work so simple for pdf files for their document structure might vary.
for pdf files try using iText API library...
if u wanna do processing those files use JAXP for xml and iText for pdf...i hope this necessaily answers ur questions.

Transparent Buttons in Java Swing?

Hi!
I want to create transparent Buttons using java swing for my desktop application. Can any one tell me how to do it?

I can help, but it depends on what you mean by "transparent".
Do you mean TOTALLY transparent, or slightly transparent, or merely translucent? Do you want the text on the button to be in any way transparent? You really need to be more specific.
Basically, though, the concept is pretty simple. All swing components have several methods that can be overridden by somebody who knows what they are doing, in order to customize their appearances.
Some of these are: paint(), paintComponent(), ComponentUI.paint(), etc.
You need to determine the right place to put the new code. Then you extend the class, and change the transparency of the graphics object passed into the method in question, and then pass control to the super implementation of that method.
There are some traps you need to make sure you avoid, though:
1. If you want transparent components, you MUST have the opaque property of the component set to false. Otherwise, the components beneath your transparent button will never update.
2. When you start messing with a graphics object to create transparency, you need to make sure that you revert your changes to the graphics object when you are finished, because all painting uses the same graphics object -> so if you set your button transparent, and then forget to remove the transparency, all objects drawn after the button will also be drawn transparent.
A word of caution:
This sort of manipulation is not hard, but you NEED to understand the painting model for SWING. There are a few articles hosted by sun that can help you in this respect.
Good Luck!
- Adam

Creating file browser GUI using java swing tree

Hi all,
I have some questions which i wish to clarify asap. I am working on a file browser project using java swing. I need to create 2 separate buttons. 1 of them will add a 'folder' while the other button will add a 'file' to the tree when the buttons are clicked once. The sample source code known as 'DynamicTreeDemo' which is found in the java website only has 1 add button which is not what i want. Please help if you know how the program should be written. Thx a lot.
Regards,

Sorry, don't know 'DynamicTreeDemo'import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.io.File;
public class Test extends JFrame {
JTree jt = new JTree();
DefaultTreeModel dtm = (DefaultTreeModel)jt.getModel();
JButton newDir = new JButton("new Dir"), newFile = new JButton("new File");
public Test() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    newDir.setEnabled(false);
    newFile.setEnabled(false);
    jt.setShowsRootHandles(true);
    content.add(new JScrollPane(jt), BorderLayout.CENTER);
    File c = new File("C:\\temp");
    DefaultMutableTreeNode root = new DefaultMutableTreeNode(c);
    dtm.setRoot(root);
    addChildren(root);
    jt.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent tse) { select(tse) ; }
    JPanel jp = new JPanel();
    content.add(jp, BorderLayout.SOUTH);
    jp.add(newDir);
    jp.add(newFile);
    newDir.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        TreePath tp = jt.getSelectionPath();
        if (tp!=null) {
          DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
          File newFile = new File((File)dmtn.getUserObject(),"foo");
          if (newFile.mkdir()) {
            dmtn.add(new DefaultMutableTreeNode(newFile));
            dtm.nodeStructureChanged(dmtn);
          } else System.out.println("No Dir");
    newFile.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        TreePath tp = jt.getSelectionPath();
        if (tp!=null) {
          DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
          File newFile = new File((File)dmtn.getUserObject(),"foo.txt");
          try {
            if (newFile.createNewFile()) {
              dmtn.add(new DefaultMutableTreeNode(newFile));
              dtm.nodeStructureChanged(dmtn);
            } else System.out.println("No File");
          catch (java.io.IOException ioe) { ioe.printStackTrace(); }
    setSize(300, 300);
    setVisible(true);
void select(TreeSelectionEvent tse) {
    TreePath tp = jt.getSelectionPath();
    newDir.setEnabled(false);
    newFile.setEnabled(false);
    if (tp!=null) {
      DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
      File f = (File)dmtn.getUserObject();
      if (f.isDirectory()) {
        newDir.setEnabled(true);
        newFile.setEnabled(true);
void addChildren(DefaultMutableTreeNode parent) {
    File parentFile = (File)parent.getUserObject();
    File[] children = parentFile.listFiles();
    for (int i=0; i<children.length; i++) {
      DefaultMutableTreeNode child = new DefaultMutableTreeNode(children);
parent.add(child);
if (children[i].isDirectory()) addChildren(child);
public static void main(String[] args) { new Test(); }

Reg: Embedding Firefox with Java Swing

Sir,
The thing is We all know that Mozilla Firefox is open source.
How to embed the mozilla firefox with Java Swing or java AWT Frame.
Could me suggest me the ways to do it, the code and also the concept behind it?
I put the same question in forum but i didnot get any response.and i also googled a lot,but none was help ful
Could u please help us Sir?
Thanks..

you can use webrenderer or jxbrowser library...to embed web browser in your swing application.
otherwise Use OLE with java to embed IE in your swing application....

A tiny font is used in many places across Java Swing applications (help!)

In many places in Java but mostly in text boxes I'm seeing a very small font that is quite hard to read.
I am seeing this all over the place in Java programs and it is getting on my nerves.
I'm not sure what is causing this.
I also encountered this issue when running Java on Windows XP.
I really need help on how to solve this,
Or maybe it is actually a bug with Java itself and Windows?
An image of the problem in SwingSet2:
[SwingSet 2 Tiny Font Example|http://img687.imageshack.us/img687/1373/swingset2tinyfont.png]
System spec:
Windows 7 Professional 32-bit (Aero is on)
Java 6 Update 20
English system locale and language
No special dpi settings (default)
Screen Resolution: 1280x1024
Avast Antivirus 5.0
An intel graphics card
Edited by: Temp111 on May 9, 2010 7:38 AM

camickr wrote:
That is not a problem. Somewhere in that code the programmer uses setFont(....) to make it a smaller font. The default font of a text component does not behave like that.
For more help create a [SSCCE (Short, Self Contained, Compilable and Executable, Example Program)|http://sscce.org/], that demonstrates the incorrect behaviour.
Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.No, it's defiantly a problem. Probably in the default fonts that Swing uses in some places.
I detected one place where I can easily trigger this issue, a JTextArea And the Windows Look and Feel, So here is a SSCCE for you:
[Picture Of Tiny Font SSCCE With Tiny Font issue|http://img88.imageshack.us/img88/7876/tinyfont.png]
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TinyFont {
     public static void main(String[] args) {
          try {
               UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
          } catch (ClassNotFoundException e) {
               e.printStackTrace();
          } catch (InstantiationException e) {
               e.printStackTrace();
          } catch (IllegalAccessException e) {
               e.printStackTrace();
          } catch (UnsupportedLookAndFeelException e) {
               e.printStackTrace();
          JFrame frame = new JFrame("Tiny Font");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          JTextArea textArea = new JTextArea("Tiny Font Test");
          frame.add(textArea);
          frame.setSize(150, 100);
          frame.setLocationRelativeTo(null);
          frame.setVisible(true);
}But I also encountered this issue in other places that use Swing.
Try SwingSet2 Source Code Tab for example: [SwingSet2|http://java.sun.com/products/jfc/jws/SwingSet2.jnlp]

Paint for Java Swing

Hello, I am making a java Swing application. I want to simulate an MS Paint in my own application (you can draw lines, circles, squares ...) I intend that this drawing is saved and loaded.
Any ideas or references?
Thank you.

This is custom painting through Java2D. The book "Filthy Rich Clients" is a really good reference on that.
http://filthyrichclients.org/
And as always, the place to start is the Swing tutorial:
http://docs.oracle.com/javase/tutorial/uiswing/
The rest is up to how good you use that brain of yours ;) Feel free to drop in when you have more specific questions or are struggling with a piece of code, I wouldn't expect too much response from open ended "how I do this?" type questions.

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