Chapter 19, Problem 1PC

Generic Linked Lists

Program Plan:

• Import required package.
• Define “GenericLinkedList” class.
  • Define “Node” class.
    • Declare a value of a list element in generic type.
    • Declare next node in the list using “Node” class.
    • Parameterized constructor for “Node” class with two parameters.
    • Parameterized constructor for “Node” class with one parameter.
  • Declare variable for head of the list.
  • Declare variable for last element of list.
  • Define the method “clear()” which is used to remove all elements from the list.
    • Initializes the index to “0”.
    • If the head of the list is not “null”, then set temp node to head of the list and performs “while” loop.
      • Remove an element in the list one by one using “while” loop.
        • Set “temp_node” to next value of “temp_node”.
        • Remove the given element by calling the method “remove”.
  • Define the method “get()” which is used to return the value at given index in the list.
    • Initializes “idx” to “0”.
    • If the head of the list is not null, then
      • Set head of list to “tempValue”.
      • Check condition using “while” loop.
        • If “idx” equals to given “index”, then return the element at given position.
        • Otherwise, increment the value of “idx” and set “tempValue” to next value of “tempValue”
  • Define the method “set()” which is used to replace the value at the specified position with the specified element and also return the previous element.
    • Initializes “idx” to “0”.
    • Check condition using “while” loop.
      • If “idx” equals to given “index”, then replace the element at given position and return the previous element.
      • Otherwise, increment the value of “idx” and set “tempValue” to next value of “tempValue”.
  • Define the method “isEmpty()” which is used to compute whether list is in empty or not.
  • Define the method “size()” which is used to compute the size of list.
  • Define the method “add()” which is used to add an element to the list.
  • Define the method “remove” which is used to remove an element from the list.
  • Define main function.
    • Create object for “Scanner” class.
    • Create object “list” in “double” type using “GenericLinkedList” class.
    • Add elements to “list” using “add()” method.
    • Display the elements in list.
    • To test the “set” method.
      • Initializes the index to “-1”.
      • Declare variable in “double” type.
      • Performs “do-while” loop.
        • Read index string from user.
        • Convert the string value in integer.
        • If the user entered index is less than “0” or greater than or equal to “size”, then display an error message.
      • Read the new element for given index.
      • Convert the string to double.
      • Replace the new element in the place of old element by calling the method “set”.
      • Display the old element in the given index.
      • Display the list after calling “set” method.
        • • To test the “get” method.
            • Initializes the index to “-1”.
            • Performs “do-while” loop.
              • Read the index from user.
              • Convert the string to integer.
              • If the user entered index is less than “0” or greater than or equal to “size”, then display an error message
            • Display the element at given index by calling the method “get()”.
          • Clear all the elements in the list by calling the method “clear()”.
          • Display the size of list after clearing the list by calling “size()” method.