The repo consists of solutions to numerous problems using different data structures and algorithms, where all solutions are coded purely in Java. It also contains solutions to HackerRank problems which I have solved so far.
You can also refer my Java Notes for a quick refresh on the Java concepts.
Java version 1.7.0_51
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
IntelliJ IDEA 14
MacBook Pro
2.6 GHz Intel Core i5
8 GB 1600 MHz DDR3