Chapter 12.2, Problem 13STQ

Program Plan Intro

“HashSet” class:

• This class is able to store a set of objects. It also implements the “Collection” interface.
• This class stores a set instead of list of items.
  • It means that there can be no duplicate elements.
• The class is named “HashSet” since the algorithm used to implement the set is called a hash table.
• The package for “HashSet” class is “import java.util.HashSet;”

Syntax for defining “HashSet” class:

HashSet<Base_type> variable_name = new HashSet<Base_type>();

From the above syntax, “Base_type” represents “Integer”, “Double” or “String”.