Miscellaneous I

Visual J++ added some extensions to the pure Java language that you can easily

disable.

The latest version of Visual J++ is 6.0. It supports JDK 1.1. 

In order to use JDK 1.2, JDK 1.3, or beyond you must follow the procedure below:

Modify the CLASSPATH in the registry. Run RegEdit.exe and locate the

following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Java VM

and modify the CLASSPATH string to include the rt.jar file from you JDK

distribution. For example:

c:\Program Files\JavaSoft\JRE\1.3\lib\rt.jar

needs to be added to the end of the CLASSPATH string, and don t forget the

semi colon separating each entry in the string. Also note the "." at the end of the

CLASSPATH string.

Roger L. Cauvin

rcauvin@homemail.com

http://www.thegym.net/rcauvin

How to set the default memory limit of java virtual machine in a java application?

Answer1: java  Xms16m  Xmx32m MainClassName

here:  Xms16m => 16meg initial memory allocation

 Xmx32m => 32meg max memory allocation

Answer2:Run your Java program with  mx switch like this:

java  mx128m ClassName

This for example will set maximum memory allocation pool to 128MB

Do the classes in java.util.zip handle password encrypted zip files? I ve looked

through the API, and I don t see any mention of it.

Answer: No, they don t. But Zip s built in encryption isn t safe anyway by today s

standards.

How do I make java apllication instalable? Q: I have written a Java application

and have the .class files in one location. How do I make it installable? Is it possible to

convert it to an executable file? 

Answer1: just create a batchfile or a .sc file (if on unix) 

Answer2: Or check 

http://installshield.com/

They have special edition for Java which lets to write additional interface for

configuring of program parameters during instalation.

I need to know how to run Multiple JVMs on one machine. As far as I know if

I run 2 different Java Programs on one machine at the same time, both of

these programs use the SAME JVM. Is this statement right? 

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