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Java Newsletters Archive: 162

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

 Issue No: 162                                              1 May  2003
12624 subscriber    

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

In this issue:
  • 1. Do you know any Java API to access Windows registry?
  • 2. Are classes implementing Externalizable considered Serializable classes?
  • 3. Latest posts on our message board
  • 4. Link to Java FAQ

  • Hello dear friends!

    Tip 1

    Question: Do you know any Java API to access Windows registry?

    Answer: I know just one - JNIRegistry.
    The com.ice.jni.registry package is a Java native interface for the Windows Registry API. This allows Java program to access, modify, and export Windows Registry resources.

    The package will work only with Java 1.1 and greater, and uses the Javasoft native interface, not the Netscape interface. The package also includes a DLL that implements the interface. The package has been used with JDK1.2, and JDK1.3, as well as JDK1.1.8.

    The package includes the pre-built DLL (debug and release), source code (both the Java and the DLL's C code), as well as the compiled Java classes.

    You can download it here:

    Tip 2

    Question: Are classes implementing Externalizable considered Serializable classes?

    Answer: Yes, since public interface Externalizable extends Serializable (according to API)

    Latest posts on our message board

    I have a password box that will be linked to a database. Once the users enter their password they will have another panel where they can register their hobbies. It is not for the net but simply on JBuilder for the moment. I had no problem setting up the GUI for both the password and the other panel (the database link will be for later!) but as I'm a very novice programmer I don't know how to link the two so that on a user's screen there is a smooth transition between the password and the hobby panel. The password class looks like this:
    more read here

    reverse string

    hi, im new to java, and i have an assignment which wants me to create a class that containsmethds to parse and manipulate a string. the class should be called StringReverser.
    Its given me an example which i dont really understand:

    public String ReverseString(String inputString)

    How do i do it?
    more read here

    Reading hex chars from assembly code

    I'm writing a Java GUI, to interpret assembly code (based on Intel x86) and store this data for output when querying with the GUI.
    Basically, when writing, I forgot to take into account the fact that numbers in assembly are in hex (yup, pretty big mistake!), and now I'm trying to implement the functionality to read and use these hex characters for memory addresses and simple hex input...
    for example:
    mov ax, [000A]
    mov [000B], 01C
    So, my problem is, I want to be able to recognise these strings as input and convert them somehow, so I can perform operations on them, such as multiplication and addition.
    Another problem that also comes from this is, I have created an array of memory addresses, but obviously in Java, these arrays run in numerical value and I need a way of recognizing hexadecimal memory addresses.
    more read here

    Interface with VB/COM+

    I am looking for an API that will allow me to interface JAVA with an existing application written in VB/COM+ Thanks.

    more read here

    Help with simple program!!!!

    Hi, not sure if this forum is intended for help on course work so apologies if not. I just really want someone to check over the program I have written and let me know if there are any glaring errors
    I must:
    1. Create a class for each type of account
    2. Create constructors for eash class, using inheritance where possible
    3. Create methods for depositing and withdrawing funds as wel as for diplaying the current balance
    4. Create additional methods to check that the account balance against the agreed overdraft limit.

    I think it almost fulfills all criteria now and i need to get 65% to pass. I would be very grateful for any further constructive criticism before I submit it.
    more read here

    calculate line


    I have a line with coordinated (x1 y1) (x2 y2).
    How can I make this line 2 times longer?
    more read here

    JPopupMenu removing borders / insets


    I have a popup menu but, though I remove the borders, there is still space at the top and bottom of the JPopupMenu. There is also a white line at the left side and a grey line (or component?) on the right of the JPopupMenu. How can I remove this space / lines from a JPopupMenu? Is this something that can be done through methods of the Swing components or is it necessary to use L&F API to remove these insets and borders?
    more read here

    Help - Heap file implementation

    Can someone help me with the heap file implementation of database? Where can I find some example coding for that? or is there anyone who has experience of that? Thanks
    more read here

    Please ask your questions and help each other at our Java Forum:

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