java - How to make .jar from .class -

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i have working .class file when use 

jar cvf myjar.jar *.class

i resulting myjar.jar not opened:

"the java jar file “myjar.jar” not launched. check console possible error messages."

thanks helping.

========== edit:

> build   > myclass.class   > myclasscanvas.class   > myclassframe.class   > manifest.txt

manifest.txt:

main-class: myclass

as mentioned in comment, need add manifest jar. call manifest.txt , must have @ least following line:

main-class: yourclass # remove comment, leave empty line

yourclass same name yourclass.class file without extension , class must have main method (public static void main(string[] args).

if have main class in subdirectories, must use them (they considered packages. instance if have directory com/foo/yourclass.class

main-class: com.foo.yourclass # remove comment, leave empty line

then pack jar:

jar cvfm myjarname.jar manifest.txt *.class

for more see manifest

edit:

i recommend use @ least maven. make life easier if have other dependencies or so. add , configure maven-jar-plugin , lot of stuff you.

edit:

alternatively, don't need use manifest file, can achieve following command

jar cvfe myjarname.jar myclass *.class

where e - specify entry point - myclass in case


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