Would the java applications be affected if change verison of Java 2 SDK

This would be a very urgent information for me. Thanks a lot if you could help!!! :
If the source codes I want to reuse is previously developed and tested with Java 2 SDK, Standard Edition (1.2.1_04) Production Release for Solaris, could I directly reuse them with Java 2 SDK, Standard Edition 1.3.1 for Windows? If not, what could I do to make the old Java application with Solaris to be able to run with Windows?

If you application is pure Java (e.g. not running external programs or using JNI), then it should run w/o changes regardless of the platform. Of course, platform specific bugs may affect reality.

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Would the java applications be affected if change verison of Java 2 SDK

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