How do I create a .jar cild

i want to do something like Jar cvf file.jar *.class but i don't see a jar compiler file 开发者_如何转开发in my jre6 java install. is the jar something separate i'm suppose to fine and install?

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You need to download the JDK. That tools is included on the JDK, not the JRE.

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The basic steps are (this will only package your class files into a jar (~zip) file):

1. Download the jdk from here and install it
2. Open a terminal and go the the directory and type jar cvf file.jar *.class
3. Run the jar file by java -cp file.jar your.package.MainClass

If you want to make it directly runnable ("double-clickable" or java -jar file.jar) then add a manifest like this tutorial.

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If you do not need any special information placed in MANIFEST.MF a jarfile is just a zip file and you can use any zip tool to create the zip file and rename it afterwards.