Chapter 17, Problem 2PP

Program Plan Intro

Program:

LinkedList.java:

• Define a class “LinkedList”.
  • Define a “LinkedList()” constructor.
    • This generates an empty linked list.
  • Define a “getFirst()” method.
    • This function returns the first element in the linked list.
  • Define a “removeFirst()” method.
    • This function returns the removed element in the list.
  • Define a “addFirst()” method.
    • This function adds an element to the front of the linked list.
  • Define the “listIterator()” function.
    • This returns an iterator for iterating through this list.
  • Define a class “Node”.
    • Declare the packages for process.
  • Define a class “LinkedListIterator” which implements ListIterator.
    • Declare the local variables.
    • Define a constructor “LinkedListIterator()”.
      • This generates an iterator point to the front of list.
        • Define “next()” method.
        • • This moves the iterator to next element.
          • Returns the traversed element.
        • Define a “hasNext()” function.
        • • Checks if there is an element after the iterator position.
          • It returns true if there is an element.
        • Define a “add()” function.
        • • This will add an element before the iterator position.
          • Then moves the iterator past to the inserted element.
        • Define a “remove()” method.
        • • This function removes the last traversed element in the list.
        • Define a “set()” function.
        • • This function set the last element to a different value.

ListIterator.java:

• Define an interface “ListIterator”.
  • Declare the “next()”, “hasNext()”, “remove()” and “set()” functions.

Tree.java:

• Define a class “Tree”.
  1. ○ Define a constructor “Tree()”.
     • It generates an empty tree.
  2. ○ Define a “addSubTree()” function.
     • This function adds an element as last child.
  3. ○ Define a “count()” method.
     • This function counts the number of leaf elements.
  4. ○ Define a “size()” method.
     • This computes the size of the tree.
     • Returns the number of non-null nodes.
  5. ○ Define a “listToString()” method.
     • This function converts list of lists as string.
  6. ○ Define a “toString()” method.
     • This function is used to convert to a string.

TreeTester.java:

• Define a class “TreeTester”.
  • Define a “main()” function.
    • Create objects for the tree.
    • Add elements to the tree.
    • Print the tree and size of the tree.