The assignment is in the photo, and the starter code is below:

import javafx.application.Application; import javafx.stage.*; import javafx.scene.*; import javafx.scene.control.*; import javafx.scene.layout.*; import javafx.event.*; import javafx.geometry.*; import java.io.*;

public class OrderSystem extends Application implements EventHandler {

// attributes private Stage stage; private Scene scene; // GridPane private VBox root = new VBox(10); private GridPane gpTop = new GridPane(); private FlowPane fpBot = new FlowPane(10,10);

// labels private Label lblName = new Label("Item Name: "); private Label lblNum = new Label("Number: "); private Label lblCost = new Label("Cost: "); private Label lblAmount = new Label("Amount owned: ");

// text fields private TextField tfName = new TextField(); private TextField tfNum = new TextField(); private TextField tfCost = new TextField(); private TextField tfAmount = new TextField();

// buttons private Button btn1 = new Button("Calculate"); private Button btn2 = new Button("Save"); private Button btn3 = new Button("Clear"); private Button btn4 = new Button("Exit");

public static final String FILE_NAME ="121Lab1.csv";

public void start(Stage _stage) throws Exception { //save stage as attribute this.stage = _stage; stage.setTitle("My Item Orders Calculator"); gpTop.addRow(0,lblName, tfName); GridPane.setHalignment(lblName, HPos.RIGHT); gpTop.addRow(1,lblNum, tfNum); GridPane.setHalignment(lblNum, HPos.RIGHT); gpTop.addRow(2,lblCost, tfCost); GridPane.setHalignment(lblCost, HPos.RIGHT); gpTop.addRow(3,lblAmount, tfAmount); GridPane.setHalignment(lblAmount, HPos.RIGHT); gpTop.setAlignment(Pos.CENTER); public static void main(String[] args) { launch(args); } // add buttons fpBot.getChildren().addAll(btn1, btn2, btn3, btn4); fpBot.setAlignment(Pos.CENTER); // add grid and flowpane root.getChildren().addAll(gpTop,fpBot); // create scene of specified size scene = new Scene(root, 400, 150); // add action handler to all buttons btn1.setOnAction(this); btn2.setOnAction(this); btn3.setOnAction(this); btn4.setOnAction(this); // conect scene with stage stage.setScene(scene); // display stage (window) stage.show(); // set amount field to not editable tfAmount.setEditable(false); }

@Override public void handle(ActionEvent evt) { Button btn = (Button)evt.getSource(); switch(btn.getText()) { case "Calculate": calculateAmount(); break; case"Save": //calculate amount calculateAmount(); // save to csv file in append mode String name = tfName.getText(); String number = tfNum.getText(); String cost = tfCost.getText(); String amount = tfAmount.getText(); FileWriter writer = null; if(!name.equals("") && !number.equals("") && !cost.equals("") && !amount.equals("")) { try { //open file in append mode writer = new FileWriter(FILE_NAME,true); writer.append("'"+name+"'"); writer.append(","); writer.append(number); writer.append(","); writer.append(cost); writer.append(","); writer.append(amount); writer.append(' '); } catch (Exception e) { System.exit(0); } try { writer.flush(); writer.close(); } catch (Exception e) { System.exit(0); } } break; case "Clear": tfName.setText(""); tfNum.setText(""); tfCost.setText(""); tfAmount.setText(""); break; case "Exit": System.exit(0); break; } }

// method to calculate amount private void calculateAmount() { try { String sN1 = tfNum.getText(); String sN2 = tfCost.getText(); double dN1 = Double.parseDouble(sN1); double dN2 = Double.parseDouble(sN2); double dAmt = dN1 * dN2; // set formatting to two decimal places String formatted = String.format("%.2f", dAmt); tfAmount.setText("" + formatted); } catch(Exception e) { System.exit(0); } }

}

Writing good code. When adding new functionality, think atomic (simple, one task) methods. Create methods to do specific tasks. Call these methods from handle. You should have done this for the Calculate button's actions, as that method needed to be called from both the Calculate and Save buttons. Load,>Next and Next Depending on how you wrote the original program you may have to make adjustments to setting the size of the scene or moving components to different areas of the layout. Load, Next, Previous The Load method is to return an integer count of items read into the program (the number of lines). As records are read, store all records in the ArrayList) for later use. If no records are loaded because of some error, or the file does not exist, a negative one (-1) is returned. This error is reported by using the Alert class to display the following message as shown After loading all the records, display the count of how many records were loaded. Message File read i 6 records read OK The Next method displays the next item in the collection of orders you read. When the last order is displayed, clicking the Next will show a message that there is no more data in the next direction. The Prev method displays the previous item in the collection of orders you read. When the first order is displayed, clicking Prev will show a message that there is no more data in the previous direction. Your program must catch and handle each separate exception, showing an appropriate message using Alert popup messages. This may mean you need to catch more than just 'Exception'. Use the String's split method when displaying an order to separate out the fields of an order. Do not duplicate any significant amount of code. Note: The opening and closing of files should be kept within the methods required. Files should not be left open through the whole program. The buttons need more explanation than the text on them. Let's add a tool tip to the button. To find how to do this, look at the Button class and search for an inherited method that will set the tool tip text for a button. Text to add should be something meaningful like for the Save button: "Calculate and save order