Question

AA. Final Project - Improved JavaFX GUI Personal Lending Library Description: In this project we will improve our personal lending library tool by (1) adding the ability to delete items from the library, (2) creating a graphical user interface that shows the contents of the library and allows the user to add, delete, check out, or check in an item. (3) using a file to store the library contents so that they persist between program executions, and (4) removing the 100 item size restriction. Sample Run: The video final.swf on the course website shows a sample run of this program. Suggestions: You have the 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. • Modify the Library class to use an ArrayList rather than an array (to eliminate the size limit) • Rewrite all of the methods in the Library class that display error messages to throw exceptions • Add the following methods to the Library class: public void delete(String title) - Removes the item with this title from the library (the ArrayList of Medialtems) public void save() - Writes all of the items out to the data file library.txt. For each Medialtem, write its title, format, whether or not it is on loan (true/false), who it is loaned to (or null, if not on loan), and the date is was loaned (or null, if not on loan). Write out some weird symbol in between each of these things - be sure to pick something that is not likely to appear in a title or someone's name. public void open() - Reads in the data from library.txt, recreates the Medialtems, and puts them into the ArrayList. When you read in each line, you will need to tokenize it based on whatever symbol you picked. Then create a new Medialtem object and set the fields appropriately. Create a JavaFX LibraryGUI class

Answer 1

import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ListView;
import javafx.scene.control.TextInputDialog;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import java.util.Optional;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;

public class LibraryGUI extends Application {

private Library library = new Library(this);
private static Button addItemBtn = new Button("Add");
private static Button checkOutBtn = new Button("Check Out");
private static Button checkInBtn = new Button("Check In");
private static Button deleteBtn = new Button("Delete");
private ListView<String> list;

@Override
public void start(Stage primaryStage) throws Exception {
HBox buttonPanel = new HBox();
buttonPanel.getChildren().addAll(addItemBtn, checkOutBtn, checkInBtn, deleteBtn);
buttonPanel.setAlignment(Pos.CENTER);
buttonPanel.setSpacing(15);

list = new ListView<String>();
list.setEditable(true);
ObservableList<String> allItems = FXCollections.observableArrayList(library.listAllItems());
list.setItems(allItems);
allItems.addListener((ListChangeListener<Object>) change -> {
System.out.println("List View Changed");
});

BorderPane bPane = new BorderPane();
BorderPane.setAlignment(list, Pos.TOP_LEFT);
BorderPane.setMargin(list, new Insets(14,14,8,14));
BorderPane.setMargin(buttonPanel, new Insets(0,8,8,8));
bPane.setCenter(list);
bPane.setBottom(buttonPanel);

//Button actions
addItemBtn.setOnAction(e -> {
addNewItem();
list.setItems(FXCollections.observableArrayList(library.listAllItems()));
});

checkOutBtn.setOnAction(e -> {
checkOutItem();
list.setItems(FXCollections.observableArrayList(library.listAllItems()));
});

deleteBtn.setOnAction(e -> {
deleteItem();
list.setItems(FXCollections.observableArrayList(library.listAllItems()));
});

Scene scene = new Scene(bPane, 750, 750);
primaryStage.setTitle("Library Form");
primaryStage.setScene(scene);
primaryStage.setWidth(bPane.getWidth());
primaryStage.setHeight(bPane.getHeight());
primaryStage.setResizable(false);
primaryStage.show();
primaryStage.setOnCloseRequest(e -> {
try {
library.save();
} catch (Exception exp) {
System.out.println(exp.getMessage());
}
});

}

//method to add an item in the list
public void addNewItem() {
  
String name = null, format = null;
TextInputDialog dialog = new TextInputDialog();
dialog.setTitle("Add Item");
dialog.setHeaderText(null);
dialog.setContentText("Name of Item: ");
Optional<String> result = dialog.showAndWait();
if (result.isPresent()) {
name = result.get();
}

dialog.setContentText("FormatType: ");
result = dialog.showAndWait();
if (result.isPresent()) {
format = result.get();
}
library.addNewItem(name, format);

}

//method to delete an item in the list
public void deleteItem() {
Object selected = list.getSelectionModel().getSelectedItem();
// gets the selected item
String s = selected.toString();
// converts that to a String
String title = s.substring(0, s.lastIndexOf("("));
// extracts the title
title =title.trim();
// removes any trailing whitespace
library.delete(title);
}

//method to check out item in the list
public void checkOutItem() {
String name = null, date = null;

TextInputDialog dialog = new TextInputDialog();
dialog.setTitle("Item Check Out");
dialog.setHeaderText(null);
dialog.setContentText("Enter Person Loaning: ");
Optional<String> result = dialog.showAndWait();
if (result.isPresent()) {
name = result.get();
}

dialog.setContentText("Date: ");
result = dialog.showAndWait();
if (result.isPresent()) {
date = result.get();
}

try {
library.markItemOnLoan(list.getSelectionModel().getSelectedIndex(), name, date);
} catch (Exception e) {
Alert alert = new Alert(AlertType.ERROR);
alert.setTitle("Error");
alert.setHeaderText(null);
alert.setContentText(e.getMessage());
}
}

//method to start GUI
public static void main(String[] args) {
Application.launch(args);
}
}

//////////////////////////////////////////////////

import java.util.ArrayList;
import java.util.Iterator;
import java.util.Scanner;
import java.io.File;
import java.io.PrintWriter;

public class Library {
private ArrayList<MediaItem> items;
private LibraryGUI gui;
ArrayList<String> masterList;
public Library(LibraryGUI gui) {
this.gui=gui;
items = new ArrayList<MediaItem>();
try {
open();
} catch (Exception exp) {
System.out.println(exp.getMessage());
}
}

public void addNewItem(String title, String format) {
items.add(new MediaItem(title, format));
System.out.println("Item Added");
System.out.println(items.get(items.size() - 1).getTitle());
}

public void markItemOnLoan(int index, String name, String date) throws Exception {
try {
items.get(index).markOnLoan(name, date);
} catch (Exception e) {
throw e;
}
return;
}

public ArrayList<String> listAllItems() {
System.out.println("List Items:");
masterList = new ArrayList<String>();
String mItem;
for (int i = 0; i < items.size(); i++) {
mItem = "";
mItem += items.get(i).getTitle();
mItem += " (";
mItem += items.get(i).getFormat();
mItem += ")";
if (items.get(i).isOnLoan()) {
mItem += (" loaned to " + items.get(i).getLoanedTo() + " on " + items.get(i).getDateLoaned());
}
masterList.add(mItem);
}
return masterList;
}

public void markItemReturned(int index) {
try {
items.get(index).markReturned();
} catch (Exception e) {
e.printStackTrace();
}
return;
}

public void delete(String title) {

Iterator<MediaItem> iter = items.iterator();
while (iter.hasNext()) {
MediaItem mItem = iter.next();
if(mItem.getTitle().equalsIgnoreCase(title))
iter.remove();
}
  
}

public void save() throws Exception {
File file = new File("library.txt");
PrintWriter pw = new PrintWriter(file);

for(MediaItem item : items) {
pw.println(
item.getTitle() + "%" + item.getFormat() + "%" + item.isOnLoan() +
"%" + (item.isOnLoan() ? item.getLoanedTo() : "null") + "%" +
(item.isOnLoan() ? item.getDateLoaned() : "null"));
}

pw.close();
}

public void open() throws Exception {
MediaItem mItem = new MediaItem();
String itemStr;
Scanner fileInput = new Scanner(new File("library.txt"));
fileInput.useDelimiter("%");

while (fileInput.hasNext()) {
mItem.setTitle(fileInput.next());
mItem.setFormat(fileInput.next());
mItem.setOnLoan(fileInput.nextBoolean());
itemStr = fileInput.next();
mItem.setLoanedTo(itemStr != "null" ? itemStr: null);
itemStr = fileInput.next();
mItem.setDateLoaned(itemStr != "null" ? itemStr : null);
items.add(mItem);
System.out.println("Item added from the File");
}
fileInput.close();
}

}

///////////////////////////////////

Screenshot: