I am having some trouble with the methods listed below Especially those that require you to return a class instead of For instance, the method unisa Library Item findItem(java lang String id) returns an Item from the Item class, but to write a method locates it based off one part of a longer string in an array is where i am having trouble Hopefully this clarifies any questions This will be done in the form of a library system that allows users to borrow various items that the library holds You will be required to create an inheritance structure to contain all the different types of items the library might hold In this case there are five different types of items Books, Magazines, Blurays, DVDs and MusicCDs You are required to create a library class that manages this system allowing an item to be added or removed in addition to allowing a person to borrow an item and return it This program is supplied with an incomplete testing program, you must complete the test driver to ensure the completeness of your library system You are also required to generate the rest of the classes to describe the items held in your library using a suitable inheritance model in your program Description of the library system There are a number of different types of items in the library There are Books, Magazines, MusicCDs and Movies Movies in turn can be DVDs or Blurays You will need to implement these items as an inheritance structure with appropriate setter and getter methods in addition to appropriate access permissions As a starting point All items contain an id (String), a name (String), loaned (boolean), borrower (Person), and a cost (double) All Books will have an author (String) All Magazines will have distributionCity (String) and a magazineFrequency (Frequency) based on an enumerated type which has day, week monthly, quarterly and yearly All Movies will have an genre (Genre) based on an enumerated type Genre which has scifi, action, drama and romance All DVDs will have a region (int) All Blurays will have region (char) All MusicCD's will have composer (String) and an artist (String) In addition to the Library class described, there are also a few other classes needed for this assignment A Library contains the list of items (ArrayList of Items) currently held by the library A Person has a name (String) and an address (String) Library items can be borrowed by a person Restrictions There are a number of rules you must follow when addressing the requirements for this assignment You must use inheritance You must have all the named classes (Library, Person, TestDriver and the two Exception objects) Your Library class must have the methods EXACTLY as specified Ill say this one again Your Library class must have the methods EXACTLY as specified If you don't it wont compile when I dump my testing class in the folder and you will fail the assignment Class Library Specification java lang Object unisa library Library public class Library extends java lang Object This class runs the library system and contains a reference to a list of items that are held within the library This list (called itemList) is of type ArrayList that contains all the items in the library This library will contain the following types of items Books Magazines DVDs (Movie) Blurays (Movie) MusicCD Each of these items will need to be stored in the array list (itemList) This list of items can then be manipulated by the methods specified in this document Author You (Change this in the source code) Field Summary Fields Modifier and Type Field and Description private int count count of all the items in the library private java util ArrayList itemList itemList contains the List of all items in the library Constructor Summary Constructors Constructor and Description Library() Method Summary All Methods Instance Methods Concrete Methods Modifier and Type Method and Description void addItem(unisa library Item newItem) Add a new item to the list of library items int countBorrowed() Return the total number of items out on loan int countMovies() Return the number of Items that are either Blurays or DVDs unisa library Item findItem(java lang String id) Find the item by the given ID and return that Item unisa library Person getBorrower(java lang String id) Gets the borrower of an item java lang String IDForName(java lang String name) Returns the id of the library item based on the name given boolean isBorrowed(java lang String id) Checks if a specific library item is borrowed void loanItem(java lang String id, unisa library Person newPerson) Changes the status of the named item to borrowed and adds the Person to the borrowed java lang String nameForID(java lang String id) Look up the name of the library item based on the ID given double percentageBorrowed() The percentage of the number of items that are out on loan unisa library Person returnItem(java lang String id) Changes the status of the named item to not borrowed and removes the user from the item java lang String toString() Convert the entire library to a string Methods inherited from class java lang Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait Field Detail itemList private java util ArrayList itemList itemList contains the List of all items in the library count private int count count of all the items in the library Constructor Detail Library public Library() Method Detail loanItem public void loanItem(java lang String id, unisa library Person newPerson) throws unisa library ItemNotFoundException Changes the status of the named item to borrowed and adds the Person to the borrowed Parameters id The ID of the item to be borrowed newPerson The borrower of the item Throws unisa library ItemNotFoundException thrown if the id is not found returnItem public unisa library Person returnItem(java lang String id) throws unisa library ItemNotFoundException Changes the status of the named item to not borrowed and removes the user from the item The borrower (person) is returned to the caller Parameters id The id of the item Returns The person who borrowed the item Throws unisa library ItemNotFoundException thrown if the id is not found findItem public unisa library Item findItem(java lang String id) throws unisa library ItemNotFoundException Find the item by the given ID and return that Item Parameters id The item to be returned Returns The item searched for Throws unisa library ItemNotFoundException thrown if the id is not found getBorrower public unisa library Person getBorrower(java lang String id) throws unisa library ItemNotFoundException Gets the borrower of an item If the item is not found throw ItemNotFoundException Parameters id the id of the item Returns the borrower of the item returns null if the item exists but is not borrowed Throws unisa library ItemNotFoundException thrown if the id is not found nameForID public java lang String nameForID(java lang String id) Look up the name of the library item based on the ID given Parameters id The id of item searched for Returns The name of the item blank if not found IDForName public java lang String IDForName(java lang String name) Returns the id of the library item based on the name given Parameters name the name of the item Returns the id of the item blank if not found addItem public void addItem(unisa library Item newItem) throws unisa library DuplicateItemException Add a new item to the list of library items Parameters newItem The new item to be added to the list Throws unisa library DuplicateItemException thrown if the item is already in the list countMovies public int countMovies() Return the number of Items that are either Blurays or DVDs Returns the number of blurays and DVDs toString public java lang String toString() Convert the entire library to a string This should call the appropriate toString methods of each item in the ArrayList Should be in the format Magazine magazineFrequency day, distributionCity San Andreas Item id ID000, name Vanity Not So Faire, loaned false, borrower null, cost 5 95 Magazine magazineFrequency day, distributionCity San Andreas Item id ID001, name Click, loaned false, borrower null, cost 5 95 Magazine magazineFrequency day, distributionCity San Andreas Item id ID002, name Renovate, loaned false, borrower null, cost 5 95 Magazine magazineFrequency day, distributionCity San Andreas Item id ID003, name Madrid, loaned false, borrower null, cost 5 95 Magazine magazineFrequency day, distributionCity San Andreas Item id ID004, name Bikes, loaned false, borrower null, cost 5 95 MusicCD composer Rudy Vale, artist ValenItem id ID005, name Gatewars Soundtrack, loaned false, borrower null, cost 19 95 MusicCD composer Rudy Vale The Third, artist ValenItem id ID006, name Gatewars 2 Soundtrack, loaned false, borrower null, cost 19 95 MusicCD composer Rudy Vale Sr, artist ValenItem id ID007, name Gatewars 3 Soundtrack, loaned false, borrower null, cost 19 95 MusicCD composer Rudy Vale Jr, artist ValenItem id ID008, name Gatewars 4 Soundtrack, loaned false, borrower null, cost 19 95 MusicCD composer Not Rudy Vale, artist ValenItem id ID009, name Gatewars 5 Soundtrack, loaned false, borrower null, cost 19 95 MusicCD composer Rudy Vale, artist Not ValenItem id ID0010, name Gatewars 6 Soundtrack, loaned false, borrower null, cost 19 95 Bluray region c, toString() Movie genre drama, toString() Item id ID0011, name Gatewars 1 Revenge of the Fallen, loaned false, borrower null, cost 29 95 Bluray region c, toString() Movie genre drama, toString() Item id ID0012, name Gatewars 2 Ponies Are Ridden, loaned false, borrower null, cost 29 95 Bluray region c, toString() Movie genre drama, toString() Item id ID0013, name Gatewars 3 Sequels are Lame, loaned false, borrower null, cost 29 95 Bluray region c, toString() Movie genre drama, toString() Item id ID0014, name Gatewars 3 But They Keep Making Them, loaned false, borrower null, cost 29 95 Bluray region c, toString() Movie genre drama, toString() Item id ID0015, name Gatewars 5 They Make More Than is Reasonable, loaned false, borrower null, cost 29 95 DVD region 1, toString() Movie genre scifi, toString() Item id ID0016, name Darth Yobbit and the Range Runners, loaned false, borrower null, cost 29 95 DVD region 1, toString() Movie genre scifi, toString() Item id ID0017, name Darth Yobbit and the Long Jumpers, loaned false, borrower null, cost 29 95 DVD region 1, toString() Movie genre scifi, toString() Item id ID0018, name Darth Yobbit and the Domain Walkers, loaned false, borrower null, cost 29 95 DVD region 1, toString() Movie genre scifi, toString() Item id ID0004, name Darth Yobbit and the KiloByte, loaned false, borrower null, cost 29 95 DVD region 1, toString() Movie genre scifi, toString() Item id ID0019, name Darth Yobbit and the Rabbits, loaned false, borrower null, cost 29 95 Book author Arthur C Clarke Item id ID0020, name The City and The Stars, loaned false, borrower null, cost 14 5 Book author Arthur C Clarke Item id ID0021, name Rendevous With Rama, loaned false, borrower null, cost 14 5 Book author Arthur C Clarke Item id ID0022, name 2001, loaned false, borrower null, cost 14 5 Overrides toString in class java lang Object isBorrowed public boolean isBorrowed(java lang String id) throws unisa library ItemNotFoundException Checks if a specific library item is borrowed Parameters id The id of the item that is to be checked Returns the status of the item whether it is borrowed or not Throws unisa library ItemNotFoundException thrown if the id is not found countBorrowed public int countBorrowed() Return the total number of items out on loan Returns The number representing the number of items currently on loan percentageBorrowed public double percentageBorrowed() The percentage of the number of items that are out on loan Expressed as a percentage of borrowed to total number of items Returns the percentage borrowed

The Answer is in the image, click to view ...

Question: I am having some trouble with the methods listed below. Especially those that require you to return a class instead of. For instance, the method

I am having some trouble with the methods listed below. Especially those that require you to return a class instead of.

For instance, the method unisa.Library.Item findItem(java.lang.String id) returns an Item from the Item class, but to write a method locates it based off one part of a longer string in an array is where i am having trouble.

Hopefully this clarifies any questions.

***************************************************************************************************************************************************************************************************

This will be done in the form of a library system that allows users to borrow various items that the library holds. You will be required to create an inheritance structure to contain all the different types of items the library might hold. In this case there are five different types of items Books, Magazines, Blurays, DVDs and MusicCDs. You are required to create a library class that manages this system allowing an item to be added or removed in addition to allowing a person to borrow an item and return it. This program is supplied with an incomplete testing program, you must complete the test driver to ensure the completeness of your library system. You are also required to generate the rest of the classes to describe the items held in your library using a suitable inheritance model in your program. Description of the library system There are a number of different types of items in the library. There are Books, Magazines, MusicCDs and Movies. Movies in turn can be DVDs or Blurays. You will need to implement these items as an inheritance structure with appropriate setter and getter methods in addition to appropriate access permissions. As a starting point: All items contain an id (String), a name (String), loaned (boolean), borrower (Person), and a cost (double). All Books will have an author (String) All Magazines will have distributionCity (String) and a magazineFrequency (Frequency) based on an enumerated type which has day, week monthly, quarterly and yearly. All Movies will have an genre (Genre) based on an enumerated type Genre which has scifi, action, drama and romance All DVDs will have a region (int) All Blurays will have region (char) All MusicCD's will have composer (String) and an artist (String) In addition to the Library class described, there are also a few other classes needed for this assignment: A Library contains the list of items (ArrayList of Items) currently held by the library A Person has a name (String) and an address (String). Library items can be borrowed by a person.

Restrictions
There are a number of rules you must follow when addressing the requirements for this assignment.
1. You must use inheritance.
2. You must have all the named classes (Library, Person, TestDriver and the two Exception objects).
3. Your Library class must have the methods EXACTLY as specified.
4. Ill say this one again Your Library class must have the methods EXACTLY as specified. If you don't it wont compile when I dump my testing class in the folder and you will fail the assignment.

Class Library Specification

java.lang.Object
- unisa.library.Library

```
public class Library extends java.lang.Object
```
This class runs the library system and contains a reference to a list of items that are held within the library. This list (called itemList) is of type ArrayList that contains all the items in the library. This library will contain the following types of items. Books Magazines DVDs (Movie) Blurays (Movie) MusicCD Each of these items will need to be stored in the array list (itemList). This list of items can then be manipulated by the methods specified in this document.

Author:

You!!! (Change this in the source code)

Field Summary

Fields
Modifier and Type	Field and Description
private int	count count of all the items in the library.
private java.util.ArrayList	itemList itemList contains the List of all items in the library.

Constructor Summary

Constructors

Constructor and Description

Library()

Constructors
Constructor and Description
Library()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
void	addItem(unisa.library.Item newItem) Add a new item to the list of library items.
int	countBorrowed() Return the total number of items out on loan.
int	countMovies() Return the number of Items that are either Blurays or DVDs
unisa.library.Item	findItem(java.lang.String id) Find the item by the given ID and return that Item
unisa.library.Person	getBorrower(java.lang.String id) Gets the borrower of an item.
java.lang.String	IDForName(java.lang.String name) Returns the id of the library item based on the name given.
boolean	isBorrowed(java.lang.String id) Checks if a specific library item is borrowed.
void	loanItem(java.lang.String id, unisa.library.Person newPerson) Changes the status of the named item to borrowed and adds the Person to the borrowed
java.lang.String	nameForID(java.lang.String id) Look up the name of the library item based on the ID given.
double	percentageBorrowed() The percentage of the number of items that are out on loan.
unisa.library.Person	returnItem(java.lang.String id) Changes the status of the named item to not borrowed and removes the user from the item.
java.lang.String	toString() Convert the entire library to a string.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail
- itemList
```
private java.util.ArrayList itemList
```
  itemList contains the List of all items in the library.
- count
```
private int count
```
  count of all the items in the library.

Constructor Detail
- Library
```
public Library()
```

Method Detail

loanItem
```
public void loanItem(java.lang.String id, unisa.library.Person newPerson) throws unisa.library.ItemNotFoundException
```
Changes the status of the named item to borrowed and adds the Person to the borrowed

Parameters:

id - The ID of the item to be borrowed

newPerson - The borrower of the item

Throws:

unisa.library.ItemNotFoundException - thrown if the id is not found.

returnItem
```
public unisa.library.Person returnItem(java.lang.String id) throws unisa.library.ItemNotFoundException
```
Changes the status of the named item to not borrowed and removes the user from the item. The borrower (person) is returned to the caller

Parameters:

id - The id of the item

Returns:

The person who borrowed the item

Throws:

unisa.library.ItemNotFoundException - thrown if the id is not found.

findItem
```
public unisa.library.Item findItem(java.lang.String id) throws unisa.library.ItemNotFoundException
```
Find the item by the given ID and return that Item

Parameters:

id - The item to be returned

Returns:

The item searched for.

Throws:

unisa.library.ItemNotFoundException - thrown if the id is not found.

getBorrower
```
public unisa.library.Person getBorrower(java.lang.String id) throws unisa.library.ItemNotFoundException
```
Gets the borrower of an item. If the item is not found throw ItemNotFoundException.

Parameters:

id - the id of the item

Returns:

the borrower of the item. returns null if the item exists but is not borrowed.

Throws:

unisa.library.ItemNotFoundException - thrown if the id is not found

nameForID
```
public java.lang.String nameForID(java.lang.String id)
```
Look up the name of the library item based on the ID given.

Parameters:

id - The id of item searched for.

Returns:

The name of the item blank if not found.

IDForName
```
public java.lang.String IDForName(java.lang.String name)
```
Returns the id of the library item based on the name given.

Parameters:

name - the name of the item

Returns:

the id of the item blank if not found.

addItem
```
public void addItem(unisa.library.Item newItem) throws unisa.library.DuplicateItemException
```
Add a new item to the list of library items.

Parameters:

newItem - The new item to be added to the list.

Throws:

unisa.library.DuplicateItemException - thrown if the item is already in the list.

countMovies
```
public int countMovies()
```
Return the number of Items that are either Blurays or DVDs

Returns:

the number of blurays and DVDs

toString

public java.lang.String toString()

Convert the entire library to a string. This should call the appropriate toString methods of each item in the ArrayList. Should be in the format

Magazine [magazineFrequency=day, distributionCity=San Andreas]Item [id=ID000, name=Vanity Not So Faire, loaned=false, borrower=null, cost=5.95] Magazine [magazineFrequency=day, distributionCity=San Andreas]Item [id=ID001, name=Click, loaned=false, borrower=null, cost=5.95] Magazine [magazineFrequency=day, distributionCity=San Andreas]Item [id=ID002, name=Renovate, loaned=false, borrower=null, cost=5.95] Magazine [magazineFrequency=day, distributionCity=San Andreas]Item [id=ID003, name=Madrid, loaned=false, borrower=null, cost=5.95] Magazine [magazineFrequency=day, distributionCity=San Andreas]Item [id=ID004, name=Bikes, loaned=false, borrower=null, cost=5.95] MusicCD [composer=Rudy Vale, artist=ValenItem [id=ID005, name=Gatewars Soundtrack, loaned=false, borrower=null, cost=19.95]] MusicCD [composer=Rudy Vale The Third, artist=ValenItem [id=ID006, name=Gatewars 2 Soundtrack, loaned=false, borrower=null, cost=19.95]] MusicCD [composer=Rudy Vale Sr, artist=ValenItem [id=ID007, name=Gatewars 3 Soundtrack, loaned=false, borrower=null, cost=19.95]] MusicCD [composer=Rudy Vale Jr, artist=ValenItem [id=ID008, name=Gatewars 4 Soundtrack, loaned=false, borrower=null, cost=19.95]] MusicCD [composer=Not Rudy Vale, artist=ValenItem [id=ID009, name=Gatewars 5 Soundtrack, loaned=false, borrower=null, cost=19.95]] MusicCD [composer=Rudy Vale, artist=Not ValenItem [id=ID0010, name=Gatewars 6 Soundtrack, loaned=false, borrower=null, cost=19.95]] Bluray [region=c, toString()=Movie [genre=drama, toString()=Item [id=ID0011, name=Gatewars 1 Revenge of the Fallen, loaned=false, borrower=null, cost=29.95]]] Bluray [region=c, toString()=Movie [genre=drama, toString()=Item [id=ID0012, name=Gatewars 2 Ponies Are Ridden, loaned=false, borrower=null, cost=29.95]]] Bluray [region=c, toString()=Movie [genre=drama, toString()=Item [id=ID0013, name=Gatewars 3 Sequels are Lame, loaned=false, borrower=null, cost=29.95]]] Bluray [region=c, toString()=Movie [genre=drama, toString()=Item [id=ID0014, name=Gatewars 3 But They Keep Making Them, loaned=false, borrower=null, cost=29.95]]] Bluray [region=c, toString()=Movie [genre=drama, toString()=Item [id=ID0015, name=Gatewars 5 They Make More Than is Reasonable, loaned=false, borrower=null, cost=29.95]]] DVD [region=1, toString()=Movie [genre=scifi, toString()=Item [id=ID0016, name=Darth Yobbit and the Range Runners, loaned=false, borrower=null, cost=29.95]]] DVD [region=1, toString()=Movie [genre=scifi, toString()=Item [id=ID0017, name=Darth Yobbit and the Long Jumpers, loaned=false, borrower=null, cost=29.95]]] DVD [region=1, toString()=Movie [genre=scifi, toString()=Item [id=ID0018, name=Darth Yobbit and the Domain Walkers, loaned=false, borrower=null, cost=29.95]]] DVD [region=1, toString()=Movie [genre=scifi, toString()=Item [id=ID0004, name=Darth Yobbit and the KiloByte, loaned=false, borrower=null, cost=29.95]]] DVD [region=1, toString()=Movie [genre=scifi, toString()=Item [id=ID0019, name=Darth Yobbit and the Rabbits, loaned=false, borrower=null, cost=29.95]]] Book [author=Arthur C Clarke]Item [id=ID0020, name=The City and The Stars, loaned=false, borrower=null, cost=14.5] Book [author=Arthur C Clarke]Item [id=ID0021, name=Rendevous With Rama, loaned=false, borrower=null, cost=14.5] Book [author=Arthur C Clarke]Item [id=ID0022, name=2001, loaned=false, borrower=null, cost=14.5]

Overrides:

toString in class java.lang.Object

isBorrowed
```
public boolean isBorrowed(java.lang.String id) throws unisa.library.ItemNotFoundException
```
Checks if a specific library item is borrowed.

Parameters:

id - The id of the item that is to be checked.

Returns:

the status of the item whether it is borrowed or not.

Throws:

unisa.library.ItemNotFoundException - thrown if the id is not found.

countBorrowed
```
public int countBorrowed()
```
Return the total number of items out on loan.

Returns:

The number representing the number of items currently on loan

percentageBorrowed
```
public double percentageBorrowed()
```
The percentage of the number of items that are out on loan. Expressed as a percentage of borrowed to total number of items.

Returns:

the percentage borrowed.

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