I am making software in java. Tell me how to convert .java file to .jar file that can be runnable [duplicate]

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Possible Duplicate:

Selecting main class in a runnable jar at runtime

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Help me to convert .java file to .jar

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use jar command

jar cf jar-file input-file(s)

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You can't convert java to jar file. You can, however, build a jar file with the jar command or use a build tool, like Ant to create a jar (or use an IDE to export as jar).

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If you want to make it "runnable", you also want to specify the Main-Class and the Class-Path in the Manifest file:

http://download.oracle.com/javase/6/docs/technotes/guides/jar/jar.html