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

Faulty version of a method “addFirst()”

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 “BadLinkedList.java”, import the package and create a class “BadLinkedList”,
    • Declare the object variable.
    • Define the constructor to create an empty linked list.
    • Define the method “reverse()”  that reverses the elements in the 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 new node.
      • Assign new node to the first position.
      • Assign the value to the new node.
      • Assign the first element to the next.
        • Define the method “listIterator()” of type “ListIterator”, that returns an iterator for iterating through the list.
        • Create a class “Node”,
          • Declare the object variable for “Object”, and “Node”.
        • Create a class “LinkedListIterator”,
          • Declare the necessary object variables.
          • Define the constructor to create 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.
              • Define the method “add()”,
                • If position is null, call the method “addFirst()”.
                  • Set the first to the position.
                • Otherwise, create a new node.
                  • Assign the element to the new node.
                  • Set the next position to the next pointer of the new node.
                  • Set the new node value to the next position.
                  • Set the new node as the position.
                • Set the position to the previous value.
              • Define the method “remove()”,
                • Check the condition,
                  • If it is true, , 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 position is null, throws an exception.
                • Set the value to the position.
  • 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 new node.
      • Assign the first element to the next pointer of new node.
      • Assign new node to the first position.
        • Define the method “listIterator()” of type “ListIterator”, that returns an iterator for iterating through the list.
        • Create a class “Node”,
          • Declare the object variable for “Object”, and “Node”.
        • Create a class “LinkedListIterator”,
          • Declare the necessary object variables.
          • Define the constructor to create 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.
              • Define the method “add()”,
                • If position is null, call the method “addFirst()”.
                  • Set the first to the position.
                • Otherwise, create a new node.
                  • Assign the element to the new node.
                  • Set the next position to the next pointer of the new node.
                  • Set the new node value to the next position.
                  • Set the new node as the position.
                • Set the Boolean value as false.
              • Define the method “remove()”,
                • Check if there is no next element, 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.
                • St the Boolean value to false.
              • Define the method “set()”,
                • If there is no next element, throw an exception.
                • Set the value to the position.
  • In a file ListTest.java”, create a class “ListTest”,
    • Define the “main()” method.
      • Create first “LinkedList” object.
      • Call the method “addFirst()” to add “Tommy” to the font of the linked list.
      • Call the method “addFirst()” to add “Roman” to the font of the linked list.
      • Call the method “addFirst()” to add “Harris” to the font of the linked list.
      • Assign the value returned from the method “listIterator()” calling by first Linked list object.
      • Print the actual and expected result.
      • Create “BadLinkedList” object.
      • Call the method “addFirst()” to add “Tommy” to the font of the linked list.
      • Call the method “addFirst()” to add “Roman” to the font of the linked list.
      • Call the method “addFirst()” to add “Harris” to the font of the linked list.
      • Assign the value returned from the method “listIterator()” calling by first Bad linked list object.
      • Print the actual and expected result.

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Chapter 16 Solutions

Big Java Late Objects

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