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Java Newsletters Archive: 178

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=== [ The Java FAQ Daily Tips, weekly publication ] ===

Issue No: 178 7 August 2003
14019 subscribers

Foreword: Excuse me for possible mistakes. English is not native language for me.

In this issue:
  • 1. My application runs much slower with 1.3/1.4 when compared with the 1.2 Production release for Solaris. Why?
  • 2. What's the difference between the -client and -server systems (options in JVM)?
  • 3. Latest posts on our message board
  • 4. Link to Java FAQ

  • Hello dear friends!

    Tip 1

    Question: My application runs much slower with 1.3/1.4 when compared with the 1.2 Production release for Solaris. Why?

    Answer: Assuming that you are running a lot of bytecode make sure that you are using the correct mode of the virtual machine. For applications where small footprint and fast startup are important, use -client. For applications where overall performance is the most important, use -server. Don't forget that -server or -client must be the first argument to java, -client is the default. If this isn't your problem, read on for more tuning parameters you can try...

    from the Java Hotspot Virtual Machine FAQ:
    http://java.sun.com/docs/hotspot/PerformanceFAQ.html

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    Tip 2

    Question: What's the difference between the -client and -server systems (options in JVM)?

    Answer: These two systems are different binaries. They are essentially two different compilers (JITs) interfacing to the same runtime system. The client system is optimal for applications which need fast startup times or small footprints, the server system is optimal for applications where the performance is most important. In general the client system is better on GUIs. Some of the other differences include the compilation policy used, heap defaults, and inlining policy.

    from the Java Hotspot Virtual Machine FAQ:
    http://java.sun.com/docs/hotspot/PerformanceFAQ.html

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    Latest posts on our message board
    JList in a JTable cell

    Is it possible to render JList into a JTable cell? If it is please provide a code sample.
    Thanks,
    EML
    please help here ...

    Object serialization

    Hi all,

    have a question for you.
    I have a socket sock, I use ObjectStream to read/write objects on the socket. If I write 2 or more times an object on the stream (the exactly same object) on the other side I don't see its state (values of attributes) changes.

    For example if I write a Dimension object 2 times and after the first writeObject I change its state with setSize, the second time I do readObject it return the SAME STATE as the first time, as I if never changed the size of Dimension.

    continues here ...

    How to realize my project

    Hi,
    I’m new on java and i should do a project to create an application to design Workflow on thin client (IE6) or a software and use Java Web Start. The design is base on the state-chart diagram. All the information concerning items (position, size) will be store under lotus Notes Documents.
    Each item (state, chart relations) will have different values selected from list. Each list will be fill in with informations descended from data contains under Lotus Notes documents.
    State and chart max number: 99
    We will use Lotus Domino R6 as HTTP server.
    In fact the applet I should create will only be use to draw, all the information are from and store under Lotus Notes

    The software should contain a zoom option, an export option(GIF,.. ) and a print option (PDF, printer)

    I found jgraph,

    continues here ...

    Open-Source Wireless App Development

    Please vote to help select the topic for open-source wireless development,after the voting is over interested candidates will be able to join the project.

    Direct Link : http://www.thesoftwareobjects.com/Projects
    Main Url:
    http://www.thesoftwareobjects.com

    problem with JPopup

    Hello,

    i have following problem.
    In a JTree i show a JPopup if i clicked with right mousebutton.
    If something is select and action the Popup i will allow to move it. This means i draw a ghost image of the selection on the position of the popup.
    I draw this image if the method actionperformed of the Popup calls.
    And when the mouse moves i draw it at the mouseposition.
    Now the problem. After the popup action the image is not draw correctly. At the position of popup it draw wight and the rest show correct.
    I have try to draw in following methods:

    -popupMenuWillBecomeInvisible and
    -propertyChange(PropertyChangeEvent e) {
    if(e.getPropertyName().compareTo("visible")==0)
    if((Boolean)e.getNewValue() == Boolean.FALSE)
    }
    continues here ...

    Rounding Oval in a rect.

    Hey everybody. Please help me create a java applet of which the ball is rounding in a rectengular/square...

    And otherone. There is bar getting longer as you press a key.

    Please please please I need you...

    Limiting JTextArea

    Basically all I want to do is limit a JTextArea to, say, four lines max. I mean 4 physical lines, not 4 sentences. Now I know about PlainDocument and I know how to determine how many carriage returns there are in the JTextArea. But sometimes there will be carriage returns and sometimes there will just be linewraps at a word space. Both create "new lines" in my situation.

    So I'm struggling determining how many lines are in the JTextArea when carriage returns aren't used and how to limit the max number of lines. I have got as far as stopping entry when the fourth line is at its maximum width but this also stops entry on previous lines if the user moves the cursor back up a line.

    At this point I'm going around in circles and need a fresh approach. Any code examples or thoughts would be sincerely appreciated.
    please help here ...


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