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Fоr this prоblem, yоu will be writing а clаss nаmed MyOrderedMap that provides an implementation of the interface below. Make sure that you are not using any raw types (i.e. you must use the generic type parameter in your solution). You do not need to include any import statements in your response. And, of course, assume the interface below compiles. public interface OrderedMap extends Iterable { int size(); void clear(); int findIndex(K key); boolean insert(int index, K key, V value) throws IndexOutOfBoundsException, IllegalArgumentException; boolean insert(K key, V value) throws IllegalArgumentException; V remove(int index) throws IndexOutOfBoundsException; V remove(K key) throws IllegalArgumentException, NoSuchElementException;} It's recommended that you read ALL of the following requirements before implementing (there are HINTS). It's strongly recommended that you implement the methods in the order in which they are detailed below to maximize code reuse and make the best use of your time. The MyOrderedMap class must have TWO private arrays. One of type K to store the keys and one of type V to store the corresponding values. The association between keys and their corresponding values must be managed by placing them at the same index in their respective arrays. IMPORTANT: There are no duplicate keys allowed in this OrderedMap, but the values can be duplicated amongst different keys. You must check to see if the ordered map contains the key before adding the pair. This class must also have a single, no-argument constructor that creates these generic arrays of type K and V, both with an initial length of 10. NOTE: For ease of implementation, you can assume that new K[length] is valid syntax for creating a new array of type K. A similar assumption can be made for an array of type V. You can earn 5 bonus points if you know the correct way to create a new array of a generic type that will compile in Java. The MyOrderedMap class should also have a nested inner class named MyOrderedMapIterator that satisfies the requirements of the Iterator interface. Note that the iterator should iterate over the KEYS in the ordered map. Remember that nested inner classes have access to the private data members of the enclosing class (i.e. the iterator will be able to access the backing arrays and any other fields the ordered map class has)! Think carefully about what state information an iterator will need to iterate over an array and don't overcomplicate it. Don't forget that one of the Iterator methods should throw a NoSuchElementException when the iterator is asked to return a KEY that doesn't exist! The message should tell the user that the ordered map contains no more keys. Descriptions of the behaviors for the OrderedMap methods are detailed below. int size() returns number of pairs currently in the ordered map HINT: the size of the ordered map isn't the same as the length of the backing arrays. You'll want to keep track of the logical size of the collection using a private field. void clear() Empties the ordered map of all pairs. All elements of the key and value arrays should be reset to null The size of the ordered map should be reset to zero int findIndex(K key) Finds and returns the integer index of the pair with the corresponding KEY, where index 0 represents the first pair in the ordered map. returns -1 if the pair with the corresponding KEY was not found. HINT: it's strongly recommended this method is implemented before ALL insert and remove methods boolean insert(int index, K key, V value) throws IndexOutOfBoundsException, IllegalArgumentException Inserts a pair at the specified position in the ordered map, where index 0 represents the first position in the ordered map. Remaining pairs should be shifted towards the end of the ordered map (see diagram). HINT: the ordered map does NOT accept duplicate keys, so the ordered map MUST be checked to see if the KEY already exists. The findIndex(...) method can be very helpful here. If the underlying array is full when a pair is inserted into the ordered map at a valid index, it must first be increased in size using the following method which you can assume exists: MyArrayUtils.doubleLength(T[] arr); // returns a T[] that is a deep copy of the T[] arr that is passed in. The returned array will have double the length of the array passed in. method throws IndexOutOfBoundsException when the index is invalid. The message should contain text describing the specific reason the index is invalid. An index is invalid if: the value of the index is negative the value of the index exceeds the size of the ordered map. NOTE: an index that points to the next immediately available slot is VALID (i.e. inserting at an index equal to the size is a valid operation) You may assume that IndexOutOfBoundsException is an unchecked exception and has a constructor that takes in a single String parameter representing the message. method throws an IllegalArgumentException when the reference passed in for the KEY is null. The message should contain text describing the reason the argument is illegal. You may assume that IllegalArgumentException is an unchecked exception and has a constructor that takes in a single String parameter representing the message. NOTE: a null reference for the VALUE is allowed. method returns true if the pair is successfully inserted, or false if a pair with the same KEY already exists in the ordered map. HINT: it's strongly recommended this method is implemented before the insert(K key, V value) method boolean insert(K key, V value) throws IllegalArgumentException Inserts a pair at the end of the ordered map. This method MUST use the insert(int, K, V) method to perform the insertion! HINT: the implementation of this method is nearly trivial if you've implemented the insert(int, K, V) method. Think about what index you need use to put something at the logical end of the map! method has the same requirements as the insert(int, K, V) method V remove(int index) throws IndexOutOfBoundsException Removes the pair and returns the VALUE of the pair at the specified position in the ordered map, where index 0 represents the first pair to be removed. Remaining pairs should be shifted towards the beginning of the ordered map (see diagram). method throws IndexOutOfBoundsException when the index is invalid. The message should contain text describing the specific reason the index is invalid. An index is invalid if: the value of the index is negative the value of the index does not point to a pair that exists within the ordered map. NOTE: an index that points to the last pair is VALID You may assume that IndexOutOfBoundsException is an unchecked exception and has a constructor that takes in a single String parameter representing the message. HINT: it's strongly recommended this method is implemented before the remove(K key) method. V remove(K key) throws IllegalArgumentException, NoSuchElementException Removes the pair and returns the VALUE of the pair corresponding to the specified KEY in the ordered map. Remaining pairs should be shifted towards the beginning of the ordered map (see diagram). This method MUST use the remove(int index) method to perform the removal! HINT: the implementation of this method is simple if you've implemented the findIndex(K key) and remove(int index) methods. Think about how you can use these two methods to find and remove the pair with the corresponding KEY (and throw the required exceptions, if necessary). method throws IllegalArgumentException when the KEY is null. The message should contain text describing the reason the argument is illegal. You may assume that IllegalArgumentException is an unchecked exception and has a constructor that takes in a single String parameter representing the message. method throws NoSuchElementException when a pair with the corresponding KEY doesn't exist within the map. You may assume that NoSuchElementException is an unchecked exception and has a constructor that takes in a single String parameter representing the message. IMPORTANT: DON'T FORGET TO IMPLEMENT THE METHOD(S) REQUIRED BY THE Iterable INTERFACE! Make sure to select the 'Preformatted' style from the dropdown so your code is formatted clearly. DO NOT USE THE TAB KEY WHEN WRITING CODE AS YOU MAY ACCIDENTALLY SUBMIT YOUR EXAM. USE THE SPACE BAR INSTEAD. Tentative estimated breakdown of the points for this question is as follows: ITEM POINTS size & clear methods 10% insert methods 30% remove methods 30% MyOrderedMap class (misc.) 10% MyOrderedMapIterator class (misc.) 20%
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