What is Margin?

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. The solution is a fairly straightforward implementation of a HashMap to map a number to a counter. It may be worth mentioning that equals and hashcode must be overwritten if the student wants to use HashMap with their own set. Note that Java will automatically unbox/box between an int and Integer. This solution takes advantage of this feature.

Twitter lets you post updates called tweets of up to 200 characters that anyone can view.

Answer the following statement true (T) or false (F)