Cracking the Coding Interview, 4 Edition - 150 Programming Interview Questions and Solutions

Solutions to Chapter 14 | Java
14.6 Suppose you are using a map in your program, how would you count the number of
times the program calls the put() and get() functions?
SOLUTION
pg 78
One simple solution is to put count variables for get() and put() methods and, whenever they
are called, increment the count. We can also achieve this by extending the existing library
map and overriding the get() and put() functions.
At first glance, this seems to work. However, what if we created multiple instances of the
map? How would you sum up the total count for each map object?
The simplest solution for this is to keep the count variables static. We know static variables
have only one copy for all objects of the class so the total count would be reflected in count
variables.
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