README.md

Nothing-Space

Will give brief about repo here later (It's working?)

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How to run any program

This repo is a Maven project (pom.xml). IntelliJ and VS Code both read it automatically, so there are no scripts to run, no terminal steps, and debugging works.

• IntelliJ IDEA: open this folder (File → Open). If you open the parent repos folder instead, right-click pom.xml → Add as Maven Project (one time only). Then click the green ▶ next to any main → Run or Debug.
• VS Code: open this folder (or the parent repos folder) and wait for the Java status bar to say it's ready. Click Run / Debug above any main, or press F5 with the file open.
• Terminal (optional): javac -d target/classes -sourcepath src/main/java src/main/java/basics/Hello.java then java -cp target/classes basics.Hello

Rules that keep every file runnable

The IDE compiles the whole repo before running a single file, so one broken file stops all of them.

1. Code lives in src/main/java/<Topic>/ and starts with package <Topic>;. Create files with New → Java Class so the IDE writes this line for you.
2. A helper class used by only one program goes inside that program's class, e.g. static class Node { ... }. Two top-level classes with the same name in one folder cause a "duplicate class" error, and then nothing runs. This was the old problem.
3. The file name must match its public class: public class GreedyExs3 goes in GreedyExs3.java. To rename, use Refactor → Rename on the class so the IDE renames the file too.
4. If a file is half-finished and doesn't compile, comment out the broken part before moving on.
5. OPPS_ADV/VirtualThread*.java need JDK 21. pom.xml skips them while JDK 17 is installed (the steps to switch are in the comment there).