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Collections

  1. Re-implement the Bitwise Microlab using BitSet instead of integers.

  2. Write a function that takes a BitSet and returns the number of steps needed to shift all 1 bits to the left (maintaining the same length() of the BitSet).

  3. Write a function that takes a BitSet and returns the number of steps needed to shift all 1 bits to the right.

Stack Microlab

A stack is a data structure that stores a list of elements. Each element is added with the push(element) method and the most recent element can be retreived with the pop() method. The peek() method returns the top element on the stack without removing it from the stack. The last element put in the stack is the first one to come out -- this is why it's called a Last In First Out (LIFO) data structure.

Create your own Stack for Strings called StringStack and implement these three methods.

Part 2:

Generalize your StringStack to a generic Stack implementation. It should include appropriate type parameters and allow storage of any object type.

hint: There may be another existing collection that is useful for implementing a stack.

Listbuilder

Create a ListBuilder interface with one method: buildList(Array a):List

Implement the interface and its method with the following classes:

  • ArrayListBuilder -- Creates an ArrayList from the given array
  • LinkedListBuilder -- Creates a LinkedList from the given array

Part 2: Override buildList with buildList(Collection c):List to take any collection type and produce the corresponding List type to the implementing class (just like part one). You may want to look at the Collection.toArray() method for this.

Iterator

Create an Iterator that produces the Fibonacci series; call it FibonacciIterator. The hasNext() method should always return true because the Fibonacci series is an infinite set.