Some projects I did when I started programming at age of 16.
Physics is just a small Java 2D game engine.
SodokuSolver is a Java programm to solve Sodokus.
Licht was a Programm that simulates to light clocks into different systems. See the description "Siumlations Anleitung.pdf" how to use it.
TextInputCalculator is a calculator that can calclaute Math-Strings, like "sin(10)^2*sqrt(ln(9.78632))+5"
VirtalInput is a C# programme that can record keyboard and mouse. You are also able to save those records and replay them. You are also able to programme your mouse and your keyboard the included editor!