Module 5 · A real program, end to end Lesson 15 of 15
Packaging, running and publishing
A jar that runs with java -jar, a README that says how to build it, and a Git repository a reviewer can open - that trio turns 'I know Java' into something someone can check.
The concept
Interviewers rarely run your code, but the README and the commit history are read. A clean repo with small commits says more about how you work than a resume bullet.
For a bigger project Maven or Gradle is expected; for a first jar the plain javac and jar commands are enough and show you understand what the tool would do for you.
javac -d out $(find src -name '*.java')
jar cfe app.jar Main -C out .
java -jar app.jar
git init && git add . && git commit -m "Console student report"
git remote add origin <url> && git push -u origin mainWorked example
javac -d out src/*.java then jar cfe app.jar Main -C out . gives one file; java -jar app.jar runs it anywhere Java is installed.
Your practice task
Build a runnable jar for your console app, write the README, and push it to GitHub.
Do this before moving on. Reading a solution teaches the shape of it; typing it teaches you.
Key takeaway
Interviewers rarely run your code, but the README and the commit history are read.
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Finish every lesson to unlock the certificate. Each one ends in a practice task — do them and the final project brief writes itself.