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In: Computer Science

Java the goal is to create a list class that uses an array to implement the...

Java the goal is to create a list class that uses an array to implement the interface below. I'm having trouble figuring out the remove(T element) and set(int index, T element). I haven't added any custom methods other than a simple expand method that doubles the size by 2. I would prefer it if you did not use any other custom methods. Please use Java Generics, Thank you.

import java.util.*;

/**
* Interface for an Iterable, Indexed, Unsorted List ADT.
* Iterators and ListIterators provided by the list are required
* to be "fail-fast" and throw ConcurrentModificationException if
* the iterator detects any change to the list from another source.
* Note: "Unsorted" only means that it is not inherently maintained
* in a sorted order. It may or may not be sorted.
*
* @author CS 221
*
* @param - class of objects stored in the list
*/
public interface IndexedUnsortedList extends Iterable
{
/**
* Adds the specified element to the front of this list.
*
* @param element the element to be added to the front of this list
*/
public void addToFront(T element);

/**
* Adds the specified element to the rear of this list.
*
* @param element the element to be added to the rear of this list
*/
public void addToRear(T element);

/**
* Adds the specified element to the rear of this list.
*
* @param element the element to be added to the rear of the list
*/
public void add(T element);

/**
* Adds the specified element after the specified target.
*
* @param element the element to be added after the target
* @param target the target is the item that the element will be added after
* @throws NoSuchElementException if target element is not in this list
*/
public void addAfter(T element, T target);
  
/**
* Inserts the specified element at the specified index.
*
* @param index the index into the array to which the element is to be inserted.
* @param element the element to be inserted into the array
* @throws IndexOutOfBoundsException if the index is out of range (index < 0 || index > size)
*/
public void add(int index, T element);

/**
* Removes and returns the first element from this list.
*
* @return the first element from this list
* @throws NoSuchElementException if list contains no elements
*/
public T removeFirst();

/**
* Removes and returns the last element from this list.
*
* @return the last element from this list
* @throws NoSuchElementException if list contains no elements
*/
public T removeLast();

/**
* Removes and returns the first element from the list matching the specified element.
*
* @param element the element to be removed from the list
* @return removed element
* @throws NoSuchElementException if element is not in this list
*/
public T remove(T element);

/**
* Removes and returns the element at the specified index.
*
* @param index the index of the element to be retrieved
* @return the element at the given index
* @throws IndexOutOfBoundsException if the index is out of range (index < 0 || index >= size)
*/
public T remove(int index);
  
/**
* Replace the element at the specified index with the given element.
*
* @param index the index of the element to replace
* @param element the replacement element to be set into the list
* @throws IndexOutOfBoundsException if the index is out of range (index < 0 || index >= size)
*/
public void set(int index, T element);

/**
* Returns a reference to the element at the specified index.
*
* @param index the index to which the reference is to be retrieved from
* @return the element at the specified index
* @throws IndexOutOfBoundsException if the index is out of range (index < 0 || index >= size)
*/
public T get(int index);

/**
* Returns the index of the first element from the list matching the specified element.
*
* @param element the element for the index is to be retrieved
* @return the integer index for this element or -1 if element is not in the list
*/
public int indexOf(T element);

/**
* Returns a reference to the first element in this list.
*
* @return a reference to the first element in this list
* @throws NoSuchElementException if list contains no elements
*/
public T first();

/**
* Returns a reference to the last element in this list.
*
* @return a reference to the last element in this list
* @throws NoSuchElementException if list contains no elements
*/
public T last();

/**
* Returns true if this list contains the specified target element.
*
* @param target the target that is being sought in the list
* @return true if the list contains this element, else false
*/
public boolean contains(T target);

/**
* Returns true if this list contains no elements.
*
* @return true if this list contains no elements
*/
public boolean isEmpty();

/**
* Returns the number of elements in this list.
*
* @return the integer representation of number of elements in this list
*/
public int size();

/**
* Returns a string representation of this list.
*
* @return a string representation of this list
*/
public String toString();

/**
* Returns an Iterator for the elements in this list.
*
* @return an Iterator over the elements in this list
*/
public Iterator iterator();

/**
* Returns a ListIterator for the elements in this list.
*
* @return a ListIterator over the elements in this list
*
* @throws UnsupportedOperationException if not implemented
*/
public ListIterator listIterator();

/**
* Returns a ListIterator for the elements in this list, with
* the iterator positioned before the specified index.
*
* @return a ListIterator over the elements in this list
*
* @throws UnsupportedOperationException if not implemented
*/
public ListIterator listIterator(int startingIndex);
}

Solutions

Expert Solution

Code for IndexedUnsortedList.java

import java.util.*;

/**
* Interface for an Iterable, Indexed, Unsorted List ADT. Iterators and
* ListIterators provided by the list are required to be "fail-fast" and throw
* ConcurrentModificationException if the iterator detects any change to the
* list from another source. Note: "Unsorted" only means that it is not
* inherently maintained in a sorted order. It may or may not be sorted.
*
* @author CS 221
*
* @param <T>
* - class of objects stored in the list
*/
public interface IndexedUnsortedList<T> extends Iterable<T> {
   /**
   * Adds the specified element to the front of this list.
   *
   * @param element
   * the element to be added to the front of this list
   */
   public void addToFront(T element);

   /**
   * Adds the specified element to the rear of this list.
   *
   * @param element
   * the element to be added to the rear of this list
   */
   public void addToRear(T element);

   /**
   * Adds the specified element to the rear of this list.
   *
   * @param element
   * the element to be added to the rear of the list
   */
   public void add(T element);

   /**
   * Adds the specified element after the specified target.
   *
   * @param element
   * the element to be added after the target
   * @param target
   * the target is the item that the element will be added after
   * @throws NoSuchElementException
   * if target element is not in this list
   */
   public void addAfter(T element, T target);

   /**
   * Inserts the specified element at the specified index.
   *
   * @param index
   * the index into the array to which the element is to be inserted.
   * @param element
   * the element to be inserted into the array
   * @throws IndexOutOfBoundsException
   * if the index is out of range (index < 0 || index > size)
   */
   public void add(int index, T element);

   /**
   * Removes and returns the first element from this list.
   *
   * @return the first element from this list
   * @throws NoSuchElementException
   * if list contains no elements
   */
   public T removeFirst();

   /**
   * Removes and returns the last element from this list.
   *
   * @return the last element from this list
   * @throws NoSuchElementException
   * if list contains no elements
   */
   public T removeLast();

   /**
   * Removes and returns the first element from the list matching the specified
   * element.
   *
   * @param element
   * the element to be removed from the list
   * @return removed element
   * @throws NoSuchElementException
   * if element is not in this list
   */
   public T remove(T element);

   /**
   * Removes and returns the element at the specified index.
   *
   * @param index
   * the index of the element to be retrieved
   * @return the element at the given index
   * @throws IndexOutOfBoundsException
   * if the index is out of range (index < 0 || index >= size)
   */
   public T remove(int index);

   /**
   * Replace the element at the specified index with the given element.
   *
   * @param index
   * the index of the element to replace
   * @param element
   * the replacement element to be set into the list
   * @throws IndexOutOfBoundsException
   * if the index is out of range (index < 0 || index >= size)
   */
   public void set(int index, T element);

   /**
   * Returns a reference to the element at the specified index.
   *
   * @param index
   * the index to which the reference is to be retrieved from
   * @return the element at the specified index
   * @throws IndexOutOfBoundsException
   * if the index is out of range (index < 0 || index >= size)
   */
   public T get(int index);

   /**
   * Returns the index of the first element from the list matching the specified
   * element.
   *
   * @param element
   * the element for the index is to be retrieved
   * @return the integer index for this element or -1 if element is not in the
   * list
   */
   public int indexOf(T element);

   /**
   * Returns a reference to the first element in this list.
   *
   * @return a reference to the first element in this list
   * @throws NoSuchElementException
   * if list contains no elements
   */
   public T first();

   /**
   * Returns a reference to the last element in this list.
   *
   * @return a reference to the last element in this list
   * @throws NoSuchElementException
   * if list contains no elements
   */
   public T last();

   /**
   * Returns true if this list contains the specified target element.
   *
   * @param target
   * the target that is being sought in the list
   * @return true if the list contains this element, else false
   */
   public boolean contains(T target);

   /**
   * Returns true if this list contains no elements.
   *
   * @return true if this list contains no elements
   */
   public boolean isEmpty();

   /**
   * Returns the number of elements in this list.
   *
   * @return the integer representation of number of elements in this list
   */
   public int size();

   /**
   * Returns a string representation of this list.
   *
   * @return a string representation of this list
   */
   public String toString();

   /**
   * Returns an Iterator for the elements in this list.
   *
   * @return an Iterator over the elements in this list
   */
   public Iterator<T> iterator();

   /**
   * Returns a ListIterator for the elements in this list.
   *
   * @return a ListIterator over the elements in this list
   *
   * @throws UnsupportedOperationException
   * if not implemented
   */
   public ListIterator<T> listIterator();

   /**
   * Returns a ListIterator for the elements in this list, with the iterator
   * positioned before the specified index.
   *
   * @return a ListIterator over the elements in this list
   *
   * @throws UnsupportedOperationException
   * if not implemented
   */
   public ListIterator<T> listIterator(int startingIndex);
}

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venereology answered 6 months ago
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