Hi guys this is my first post and i am really new to java. As a student in finance i used matlab and R and java is really complicated(very long, it takes 3 lines in matlab to read a file and making a chart, it takes 200 lines in java...) for me but i have to do some work. I created a project and then a single package then 5 .java files. now i want to crate a jar file... i searched a lot on the internet. i could create the file but when i run it, it runs only the first .java file.... although the other .java files are in the jar because when check the contents i can see clearly the names of the other .java files... what should i do so that the jar file reads all .java files ?