Re: Java Version Functionality

Juan Singh <>
Thu, 01 Feb 2007 11:22:02 -0500
<> wrote:

Hi, I am assuming I can't do this, but I figured I would ask.

I have to support a minimum java version. Is their any way of
detecting the version, and if the version is x or greater then some
specific task, otherwise skip the task.

If I can't do this (which is what I am assuming) is their a way I can
do a similar thing to #ifdef in C++ which will allow me to compile two


Use the following code to check the version of VM.


Refer to
for details.

Java does not have preprocessors like C/C++. If you use a class that is
in the newer version but not in the older, you will get
ClassNotFoundExceptions at run time. Therefore, you could do something
like this in the code.

String version = System.getProperty("java.specification.version");

    OldClass myObject = new OldClass();
}else if(version.equals("1.5")){
    NewClass myObject = new NewClass();

Since classes are loaded on demand in Java, your code should never load
NewClass if you are using 1.4

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