CSci 2101 Problem set 4.

Due Friday March 21 at 11:59pm

You may work individually or in pairs.

Problem 1 (25 points)

Problem 14 on p. 239 specifies methods and behavior of a set. Implement and test a class Set<E> with the following differences from the one described in the book:

• The class must be generic Set<E>, where E is the type of the elements in the set. For instance, you would be able to create Set<String> or Set<Integer>. All methods that take or return elements should take or return objects of type E.
• The class should use ArrayList, and not an array, to store the elements.
• Instead of the method createSet just write a constructor that creates an empty set, i.e. you should be able to create a set of strings as new Set<String>()
• Other methods are:
  • isEmpty() that returns true if this set is empty and false otherwise,
  • size() that returns the size of the set (the number of elements)
  • add(E element) adds an element to a set if it's not already present.
  • contains(E element) returns true if an element is present in the set and false otherwise.
  • union(Set<E> otherSet) returns a new Set<E> that is the union of this set and the other set. Make sure you follow definition of set union.
  • intersection(Set<E> otherSet) returns a new Set<E> that is the intersection of this set and the other set. Make sure you follow definition of set intersection.
  • removeAll() removes all elements from the set.
  Recall that a set contains every element at most once, so don't add duplicated elements to a set. That's especially important for union and intersection operations.
  Write tests for your methods before you implement the methods. Add them as you are adding new methods.

Submit your Set class and your test class. The quality of your testing will be a part of the grade.

How to submit

Submit the java file(s) with your testing code by e-mail to me. The subject of the message must be 2101 Problem set 4. Make sure to CC your group partner(s) if any.

CSci 2101 course web site.