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I have set of .java files in different packages. For example,

src |- Main.java |- pkg1 |- pkg2 |- A.java |- B.java |- C.java |- pkg3 |- pkg4 |- D.java |- E.java

How can I compile all these .java files and then build the .jar library using command line in Windows platform ?

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    Read the documentation of javac (the compiler), and jar (the archiver), and you'll eventually need java (to run the code). Commented Aug 26, 2015 at 22:35

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You should really use an IDE, its much easier and more productive. It can be done:

javac Main.java pkg1\pkg2\A.java pkg1\pkg2\B.java pkg1\pkg2\C.java pkg3\pkg4\D.java pkg3\pkg4\E.java
jar -cf my.jar  *.class pkg1 pkg3

That will not have a manifest so it won't be executable.

To make it executable, you need to pick a Main class and create a file named manifest.txt with a text editor:

Manifest-Version: 1.0
Main-Class: Main

and make the jar with this:

 jar -cmf manifest.txt my.jar  *.class pkg1 pkg3
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I can't use and ide for this. I have to do it manually. I have to grab the files in the directory and compile and then build the jar through a scheduled process..
I've found much easier way to compile using a batch file with the command, for /r %%a in (*.java) do ( javac "%%a" ). Created the .jar file using your command. Thanks for the help :)
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Another option is Apache ANT. See their tutorial to get started.

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