uni-java-exercises

Project overview

This repository contains a set of small Java exercises (originally authored for BlueJ) used for learning basic algorithms, data structures and small program architecture. Each exercise is contained in its own folder under exercises/ and is self-contained: source files, BlueJ metadata and short notes (where available).

The exercises include simple linked-list implementations, the N-Queens problem, a bottom-up LIS implementation, a 15-puzzle project, and a Huffman coding example among others. The codebase is intended for learning and experimenting, not production use.

Repository layout

• exercises/ — top-level folder containing numbered exercise folders (es_1 .. es_8).
  • es_1/ — simple string list (StringSList) and a starter driver.
  • es_2/ — integer list (IntSList) and a RoundTable example with a test driver.
  • es_3/ — N-Queens solver with Board and helper list utilities.
  • es_4/ — another N-Queens variant and an SList implementation; includes a queens/ subfolder.
  • es_5/ — small single-file exercise (es5.java).
  • es_6/ — BottomUpLIS implementation (dynamic programming example).
  • es_7/ — 15-puzzle implementation (puzzle15 and View) and generated Javadoc in doc/.
  • es_8/ — Huffman coding implementation with Node, NodeQueue, NodeStack and sample inputs C.txt/D.txt.

Each es_* folder now includes a README.md that explains the files inside, how to compile/run them and testing tips. Open the folder and read that file for exercise-specific guidance.

Quick start — compile & run (WSL / Linux / macOS style)

Open a terminal (WSL is fine on Windows) and change into the exercise folder you want to run. For example, to work on es_3:

cd exercises/es_3

Compile all Java files in that folder:

javac *.java

Run the driver (replace MainClass with the public class that contains main, usually the filename without .java):

java MainClass

Examples

• If Queens.java is the driver in es_3, run:

java Queens

• For the Huffman example in es_8, the program may accept a filename argument. Try:

cd exercises/es_8
javac *.java
java Huffman C.txt

If you see compilation errors about package declarations, open the .java files and either adjust the package lines to match directories or remove the package line for quick command-line compilation.

BlueJ notes

These exercises were originally created in BlueJ and include .ctxt and package.bluej files. To use BlueJ:

1. Open BlueJ and choose Open Project → select an es_* folder.
2. BlueJ will show classes visually and allow running main methods or calling individual methods interactively.

BlueJ is convenient for stepping through small programs and inspecting object state during execution.