Description
Program Description
In Assignment #10, you are given three files Assignment10.java,
LinkedList.java, and ListIterator.java. You will need to add additional
methods in the LinkedList class in the LinkedList.java file. The LinkedList will
be tested using strings only.
Specifically, the following methods must be implemented in the LinkedList
class:
(You should utilize listIterator() method already defined in the LinkedList
class to obtain its LinkedListIterator object, and use the methods in the
4/9/2020 Assignment 10: CSE 205: Object-Oriented Program & Data (2020 Spring)
https://canvas.asu.edu/courses/44324/pages/assignment-10?module_item_id=3074016 4/7
LinkedListIterator class to traverse from the first element to the last element
of the linked list to define the following methods.)
1. public String toString()
The toString method should concatenate strings in the linked list, and return
a string of the following format:
{ Apple Banana Melon Orange }
Thus it starts with “{” and ends with “}”, and there is a space between
strings and “{” or “}”. If the list is empty, it returns “{ }” with a space in
between. Note that all elements in the linked list will be added in
alphabetical order.
2. public int size()
The size method returns the number of strings that the linked list contains at
the time when this method is called.
3. public void addElement(Object element)
The addElement adds the parameter element into the linked list. The linked
list should contain all elements (strings) in alphabetical order. Therefore, in
this addElement method, a correct location to insert the parameter element
needs to be searched and the element needs to be inserted in that location.
4. public void removeElementsAtEvenIndices( )
The removeElementsAtEvenIndices should remove objects at even indices
within the linked list. For instance, if the linked list contains { Apple Banana
Melon Orange }, then after calling this method, the linked list should contain
{ Banana Orange } since Applet at the index 0 and Melon at the index 2
need to be removed. Each element within the linked list can be labeled
starting at index 0, and based on this assumption, elements should be
removed. If the linked list does not contain any element, then the method
should not change its content.
5. public int howManyAppearBefore(Object element)
The howManyAppearBefore method should search the parameter object (a
string in this case) in the linked list, then it should count how many elements
appear before the first occurrence of the parameter object/element and
return it. If the linked list does not contain the parameter object/element in it,
then this method should return -1.
6. public int indexOfLast(Object element)
4/9/2020 Assignment 10: CSE 205: Object-Oriented Program & Data (2020 Spring)
https://canvas.asu.edu/courses/44324/pages/assignment-10?module_item_id=3074016 5/7
The indexOfLast method should look for the last occurrence of the
parameter object (a string in this case) in the linked list, and return the index
of its location. If the linked list does not contain the parameter
object/elements in it, then this method should return -1.
7. public void duplicateEach( )
The duplicateEach method should duplicate each element in the linked list.
For instance, if the linked list contains { Apple Banana Melon Orange }, and
this method is called, then the linked list will contain { Apple Apple Banana
Banana Melon Melon Orange Orange } If the linked list is empty, then it
should not change the content of the linked list.
8. public Object removeElementAt(int)
The removeElementAt method should look for an object at the parameter
index, and it should remove and return the object at the index location. If the
parameter index is larger or smaller than the existing indices, it should throw
an object of the IndexOutOfBoundsException class.
Test your LinkedList class with the given Assignment10.java file.
It is recommended to test boundary cases such as the cases where the
linked list is empty, when it contains only one element, when
adding/removing at the beginning or at the end of the linked list.
Test Cases
Download the following input files, and the following output files. Save them
in the same directory as Assignment10.java is located.
input1.txt (https://canvas.asu.edu/courses/44324/files/14414609/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414609/download?
wrap=1)
input2.txt (https://canvas.asu.edu/courses/44324/files/14414610/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414610/download?
wrap=1)
input3.txt (https://canvas.asu.edu/courses/44324/files/14414611/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414611/download?
wrap=1)
input4.txt (https://canvas.asu.edu/courses/44324/files/14414613/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414613/download?
wrap=1)
4/9/2020 Assignment 10: CSE 205: Object-Oriented Program & Data (2020 Spring)
https://canvas.asu.edu/courses/44324/pages/assignment-10?module_item_id=3074016 6/7
output1.txt (https://canvas.asu.edu/courses/44324/files/14414614/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414614/download?
wrap=1)
output2.txt (https://canvas.asu.edu/courses/44324/files/14414615/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414615/download?
wrap=1)
output3.txt (https://canvas.asu.edu/courses/44324/files/14414616/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414616/download?
wrap=1)
output4.txt (https://canvas.asu.edu/courses/44324/files/14414618/download?
wrap=1) (https://canvas.asu.edu/courses/44324/files/14414618/download?
wrap=1)
Error Handling
Your program should be robust enough to handle all test cases above.
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What to turn in:
-Submit your Assignment10.java, LinkedList.java, and ListIterator.java files
using Gradescope-> Assignment10. Make sure that your files are compiling
and passing all test cases. You can submit multiple times until the
assignment deadline.
Grading Criteria:
____/ 5 Documentation (Each class file needs to have a header with your
name, your information, and program description, each method needs its
description and comments within your code)
____/ 1 Indentation and spacing (easy to read)
____/ 6 Required classes/methods and functionalities implemented
____/ 8 Produces correct results (test cases – auto graded)
Total points: 20
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