How to Develop the executable or JAR file in intelliJ IDEA?

Hello, dear users and Owner JGuru, i m using IntelliJ IDEA 4.5 version and have complete all my work related to development of project. Now i want to create an executable file for my project like JAR file for my project and in need of that i searched alot and i found nothing on it. Please tell me the proper way in detail how to create JAR file through "IntelliJ IDEA 4.5" give any detailed example on it. Which makes any program running on double click? please kindly inform soon coz my submission date is very close. thankyou **

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