Sudoku puzzles use 9 x 9 grid in which each column, row, and 3 x 3 sub-grids must contain all digits from 1 to 9.

This project is a multi-threaded application that determines whether the solution to a Sudoku puzzle is valid

A binary tree which displays in pre-order binary

An online shopping cart using customer ID which links to an account. Each user account has a shopping cart and current orders

Login and password required

JUnit testing implemented

Program that finds and counts the number of duplicates within an array