Question

You have been working with the arrays for the past few weeks and you have learned their limitations.

In this assignment, you will be using a new data structure, HashMaps, to repeat Assignment 8.3.

Main Method

• (5 points) Declare and initialize an HashMap with values of type of type Employee, and keys of type integer. In a while loop, keep initializing objects of type Employee, storing them in the HashMap, and allow the user to enter ID, salary, and leaveDays of the each employee one by one and in one line. Once the user entered a -1, stop initializing new employees, and print "You entered [actual length of array] employees. Thank you!"
• (5 points) In a foreach loop, go through every Employee object in the HashMap, and calculate their monthly payments, using the calcMonthlyPayment() method.
• (10 points) In a second foreach loop, go through every Employee object in the HashMap, and call their makePayment method only if their leaveDays is NOT higher than 21.

Sample Run: For the below input:

1 120000 6
2 50000 25
3 140000 4
4 112000 22
5 130000 4
-1

The output will be:

You added 5 employees! Thank you!
Monthly payment for employee 1 is calculated.
Monthly payment for employee 2 is calculated.
Monthly payment for employee 3 is calculated.
Monthly payment for employee 4 is calculated.
Monthly payment for employee 5 is calculated.
A payment of 10000 was made to employee 1.
A payment of 11666 was made to employee 3.
A payment of 10833 was made to employee 5.

Answer 1

HashMap is a Map based collection class that is used for storing Key & value pairs, it is denoted as HashMap<Key, Value> or HashMap<K, V>.
Items can be added to HashMap by using put() method as map.put(key,value). We can access a value of HashMap by get() method as map.get(key). We can remove an item from HashMap using remove() method as map.remove(key). (Assumed map is a HashMap Object).

Output: