Question

The goal of this project is to create a “personal lending library” tool. The user wants to keep track of their movies and games – which ones they own, whether or not they are currently loaned out to anyone, and if so, who they were loaned to and on what date. For each item in the library, the program should know its title and format. For a movie, the format is BlueRay or DVD. For a game, the format is the platform the game runs on, such as Windows, Mac, XBox, Playstation, etc. The program should be capable of storing up to 100 items in the library. Right now our library will be wiped when the program terminates, but in the next half of the class we will learn how to make the information stick around between program executions. The program should be capable of the following actions:

 Adding a new item to the library

 Marking an item in the library as on loan

 Listing all of the items in the library (title and format and, if it is currently on loan, the person it is loaned to and the date of the loan)

 Marking an item as returned

Sample Run

: 1. Add new item

2. Mark an item as on loan

3. List all items

4. Mark an item as returned

5. Quit What would you like to do?

1

What is the title?

Star Wars

What is the format?

DVD

You have freedom to design your program however you want, provided that it meets the requirements and follows good design principles. However, if you would like some ideas of where to start, they are provided in this section. This program lends itself well to having two classes, MediaItem and Library, with the fields and methods described below.

Answer 1

PROGRAM:

MediaItem.java
===============

public class MediaItem {
private String title;
private String format;
private boolean onLoan;
private String dateLoaned;
private String loanedTo;

public MediaItem(){
title = null;
format = null;
dateLoaned = null;
loanedTo = null;
onLoan = false;
}

public MediaItem(String title, String format){
this.title = title;
this.format = format;
this.onLoan = false;
this.dateLoaned = null;
this.loanedTo = null;

}

public void markOnLoan(String name, String date){
if(onLoan)
System.out.println("The media is already loaned to " + loanedTo + " on " + dateLoaned);
else {
this.loanedTo = name;
this.dateLoaned = date;
this.onLoan = true;

}
}

public void markReturned(){
if(!onLoan)
System.out.println("The media is not yet loaned to anyone");
else {
this.loanedTo = null;
this.dateLoaned = null;
this.onLoan = false;
}
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getFormat() {
return format;
}

public void setFormat(String format) {
this.format = format;
}

public boolean isOnLoan() {
return onLoan;
}

public void setOnLoan(boolean onLoan) {
this.onLoan = onLoan;
}

public String getDateLoaned() {
return dateLoaned;
}

public void setDateLoaned(String dateLoaned) {
this.dateLoaned = dateLoaned;
}

public String getLoanedTo() {
return loanedTo;
}

public void setLoanedTo(String loanedTo) {
this.loanedTo = loanedTo;
}

}

Library.java
===========
import java.util.Scanner;

public class Library {
private MediaItem[] items = new MediaItem[100];
private int numberOfItems;

private static Scanner keyboard = new Scanner(System.in);

public int displayMenu(){
int choice;

System.out.println("1. Add new item");
System.out.println("2. Mark an item as on loan");
System.out.println("3. List all items");
System.out.println("4. Mark an item as returned");
System.out.println("5. Quit");

System.out.print("What would you like to do? ");
choice = keyboard.nextInt();

while(choice < 1 || choice > 5)
{
System.out.print("Invalid choice. Please re-enter option (1-5): ");
choice = keyboard.nextInt();
}
keyboard.nextLine(); //remove newline
return choice;
}

public void addNewItem(String title, String format){
if(numberOfItems < items.length){
items[numberOfItems] = new MediaItem(title, format);
numberOfItems++;
}
else {
System.out.println("No more space to add new item");
}
}

public void markItemOnLoan(String title, String name, String date){
int index = -1;

for(int i = 0; i < numberOfItems; i++){
if(items[i].getTitle().equals(title))
{
index = i;
break;
}
}

if(index == -1)
System.out.println("I'm sorry, I couldn't find " + title + " in the library");
else {
items[index].markOnLoan(name, date);
}

}

public String[] listAllItems(){
String[] str = new String[numberOfItems];

for(int i = 0; i < numberOfItems; i++){
str[i] = items[i].getTitle() + "(" + items[i].getFormat() + ")";

if(items[i].isOnLoan()){
str[i] += " loaned to " + items[i].getLoanedTo() + " on " + items[i].getDateLoaned();
}
}
return str;
}

public void markItemReturned(String title){
int index = -1;

for(int i = 0; i < numberOfItems; i++){
if(items[i].getTitle().equals(title))
{
index = i;
break;
}
}

if(index == -1)
System.out.println("I'm sorry, I couldn't find " + title + " in the library");
else {
items[index].markReturned();
}
}

public static void main(String[] args) {
Library library = new Library();
int choice = 0;
String title, name, date, format;
String[] str;
while(choice != 5){
choice = library.displayMenu();
switch(choice){
case 1:
System.out.print("What is the title? ");
title = keyboard.nextLine();
System.out.print("What is the format? ");
format = keyboard.nextLine();
library.addNewItem(title, format);
break;
case 2:
System.out.print("Which item (enter the title)? ");
title = keyboard.nextLine();
System.out.print("Who are you loaning it to? ");
name = keyboard.nextLine();
System.out.print("When did you loan it to them? ");
date = keyboard.nextLine();
library.markItemOnLoan(title, name, date);
break;

case 3:
str = library.listAllItems();
for(int i = 0; i < str.length; i++)
System.out.println(str[i]);
break;

case 4:
System.out.print("Which item (enter the title)? ");
title = keyboard.nextLine();
library.markItemReturned(title);
break;
case 5:
break;
}

System.out.println();
}

System.out.println("Goodbye!");

}
}