How to organize codeline for both java ME and java SE?

Hi,
I am working on a project that requires a library for java ME and java SE versions, I wonder what is the best practice for codelines
1) put ME and SE source in different directory. If some java files are identical, just put seperate copy and maintain them seperately.
or
2) create a "common" directory and put common files in it. create a ME and SE directory for java files that ME, SE are different
or
3) Use one directory. Try to make ME and SE java files be the same. i.e. only use java 1.1 features and a limited util classes (like not use HashMap, ArrayList etc... for SE version)
I wonder what is good for easy development and easy sustaining?

If it's a desktop app, put them all in a JAR file, add CLASSPATH to the manifest, and make it executable.
If it's a Web app, put them all in a WAR file.
If it's an enterprise app, put them all in an EAR file.
MOD

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How to organize codeline for both java ME and java SE?

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