How do I make a JAR from a .java file?

Question

I was writing a simple program using a Java application (not application that has projects, but application within a project; .java) that has a single frame. Both of the files are .java so I can't write a manifest needed by the JAR.

The MyApp.java starts like a class with package, imports then public class MyApp and has a main function, but it's still .java file! I'm writing it in JDeveloper 11g if it helps.

Any ideas how to make a JAR from these files?

Answer 1

Open a command prompt.

Go to the directory where you have your .java files

Create a directory build

Run java compilation from the command line

javac -d ./build *.java 

if there are no errors, in the build directory you should have your class tree

move to the build directory and do a

jar cvf YourJar.jar * 

For adding manifest check jar command line switches

Answer 2

Simply with command line:

javac MyApp.java jar -cf myJar.jar MyApp.class 

Sure IDEs avoid using command line terminal