Big Java Late Objects
Big Java Late Objects
2nd Edition
ISBN: 9781119330455
Author: Horstmann
Publisher: WILEY
Question
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Chapter 16, Problem 7PE
Program Plan Intro

Reimplementation of “LinkedList” class

Program plan:

  • In a file “ListIterator.java”, create an interface “ListIterator”,
    • Declare the method “next()” that moves the iterator past the next element.
    • Declare the method “hasNext()” that check if there is an element after the iterator position.
    • Declare the method “add()”  that adds an element before the position of the iterator and moves the iterator past the added element.
    • Declare the method “remove()” that removes the last traversed element.
    • Declare the method “set()” to set the last traversed element to a previous value.
  • In a file “Node.java”, create a class “Node”,
    • Create necessary object variables.
    • Define the constructor to create initial node.
    • Define the method “getData()”,
      • Return the node value.
        • Define the method “getNext()”,
          • Return the next reference.
        • Define the method “setData()”,
          • Set the node value.
  • In a file “LinkedList.java”, import the package and create a class “LinkedList”,
    • Declare the object variable.
    • Define the constructor to create an empty linked list.
    • Define the method “getFirst()” that returns the first element in the linked list.
    • Define the method “removeFirst()” to remove the first element in the linked list.
    • Define the method “addFirst()” that adds an element to the front of the linked list,
      • Create a new node.
      • Assign the value to the first reference.
        • Define the method “listIterator()” of type “ListIterator”, that returns an iterator to iterate through the list.
        • Define the method “getFirstNode()” to get the first reference.
  • In a file “LinkedListIterator.java”, import the package and create a class “LinkedListIterator”,
    • Declare the necessary object variables.
    • Define the constructor that creates an iterator that points to the front of the linked list.
    • Define the method “next()”,
      • If there is no next element then throws an exception.
      • Assign the position to the front of the linked list.
      • Check if position is null, set the first element to the position.
      • Otherwise, set the next position to the current position.
      • Returns the value.
        • Define the method “hasNext()” that check whether there is next element,
          • Check if position is null,
            • Returns true if first reference is not null.
              • Otherwise,
                • Returns true, if the next reference of the position is not null.
        • Define the method “add()”,
          • If position is null, call the method “addFirst()”.
            • Set the first to the position.
              • Otherwise, create a new node.
                • Create a new node.
                • Call the method “setNext()”.
                • Set the new node as the position.
              • Assign the position to previous.
        • Define the method “remove()”,
          • Check if the position is same as previous, throws an exception.
          • If position is same as the first, calls the method “removeFirst()”.
          • Otherwise,
            • Set the next position to the previous position.
              • Set the previous to the positions.
        • Define the method “set()”,
          • If the position is null, throws an exception.
          • Call the method “setData()”.
  • In a file “ListTest.java”, create a class “ListTest”,
    • Define the “main()” method.
      • Create the “LinkedList” object.
      • Call the method “addFirst()” to add “Tommy” to the front of the linked list.
      • Call the method “addFirst()” to add “Roma” to the font of the linked list.
      • Call the method “addFirst()” to add “Harris” to the font of the linked list.
      • Call the method “addFirst()” to add “David” to the font of the linked list.
      • Assign the value returned from the method “listIterator()” calling by  “LinkedList” object.
      • Call the method “next()”.
      • Call the method “next()”.
      • Call the method “add()” to add the element “John”.
      • Call the method “add()” to add the element “Nick”.
      • Call the method “next()”.
      • Call the method “remove()” to remove the last traversed element.
      • Get the iterator.
      • Execute a loop,
        • Print the actual output.
              • Print the new line.
              • Print the expected output.
              • Get the iterator.
              • Create a node.

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Big Java Late Objects

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