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how to check the version of jar file?

I am currently working on a J2ME polish application, just enhancing it. I am finding difficulties to get the exact version of the jar file. Is there any way to find the version of the jar file for the imports done in the class? I mean if you have some thing, import x.y.z; can we know the version of the jar x.y package belongs to?

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Decompress the JAR file and look for the manifest file (META-INFMANIFEST.MF). The manifest file of JAR file might contain a version number (but not always a version is specified).


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