HashMap => /src/com/datastructure/hashmap/HashMapCustom.java : GenericType
BinarySearch => /src/com/datastructure/binarysearch/BinarySearchTree.java : GenericType
LinkedList => /src/com/datastructure/linkedlist/LinkedListCustom.java : GenericType
Queue => /src/com/datastructure/queue/PersonQueue.java : PersonType
Stack => /src/com/datastructure/stack/PersonStack.java : PersonnType
Person => /src/com/entity/Person.java : the pojo class of Person for testing data structure