Chapter 11, Problem 6E

Program Plan Intro

Program plan:

• Import necessary packages.
• Create a class “CountUniqueClient”,
  • Define the main method,
    • Create the set.
    • Add the values to the list.
    • Call the method “countUnique()”.
    • Display the result.
  • Define the static method “countUnique”.
    • “if” condition is initialized to check whether the size of the list is equal to zero.
      • Return the value zero.
        • Otherwise, returns the size of the list.