Write a program that uses a HashMap to compute a histogram of positive numbers entered by the user. The HashMap’s key should be the number that is entered, and the value should be a counter of the number of times the key has been entered so far. Use −1 as a sentinel value to signal the end of user input. For example, if the user inputs:
5
12
3
5
5
3
21
-1
then the program should output the following (not necessarily in this order):The number 3 occurs 2 times.The number 5 occurs 3 times.The number 12 occurs 1 times.The number 21 occurs 1 times.
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