- Map interface: 
HashMap and TreeMap --> In a treemap, the keys are sorted
Keys are unique
Keys + values ---> entries

Concordances

Plan:
1. Populate the map based on the input text
2. Display the concordances

Example#1: Concordances

- Queue: 
PriorityQueue implements the Queue interface: sorts the values

PQ (Priority queue sorting algorithm)
1	5	4	2 (n elements)

Step#1: insert the elements of the unsorted list of values into a PQ through n PQ insert
operations

Step#2: Get the values back from the PQ by performing n PQ remove operations

1	2	4	5




