LAB EXERCISE 14: Bar Chart

Goal: In this exercise, you will learn how to:
1. Insert the Main Method (Main Entry Point to the Java Program)
2 Import a Java Class Library
3. Declare Variables and Initialize
4. Create a Constructor (Special Method)
5. Create a Void Method
6. Create an Array to store data of the same data type
7. Use the Do While Loop and the For Loop for the iteration of executing the code.
8. Create an Object from the Class
9. Call the Object’s Method

Program Specifications:
Create an application that prompts the user to enter today’s sales for five scores. The program should then display a simple bar graph comparing each store’s sales. Create each bar in the graph by displaying a row of asterisks (*). Each asterisk in the bar represents $100 in sales.

A. Pre-requisites:
1. Create a folder on your desktop Exercise-14

2. Launch Java EE- Eclipse
Note: You will need to use the Java Perspective Workbench for this exercise

3. Setup your Eclipse Workspace to point to the Exercise-14 folder
a. Select File-> Switch Workspace
b. Browse and select your Exercie-14 folder as your Workspace.

B. Requirements:

1. Create a Java Project and name it as BarChart

2. Create the first Class that will have the Main Method

a. Name the Class as MainApp

b. Choose the main method to insert into the class

3. Create the second Class that will have the Constructor and Method

a. Name the Class as BarChart

b. Do not select the main method stub

C. Requirements for the BarChart Class:

1. Insert the import java.util.Scanner class which will allow data to be inputted from the console.

2. Declare the variable- numStore and salesPer100 using the integer data type.

3. Declare the array storeArray[] using the integer data type. This will store the monthly sales for each of the 5 stores.

4. Create the Constructor called BarChart() that that will prompt the user to input the data.

a. Initialize the numStore to 1

b. Declare the scanner input class objects - Scanner inputSales = new Scanner(System.in);

c. Used the Do While Loop to perform the following iteration:
NOTE: The Do While Loop is a post-test loop which test the conditional expression AFTER each iteration
1. Prompt the user to input the monthly sales. Below is the code
2. Store the monthly sales in the array

System.out.print("Store " + numStore + " Enter monthy sales: $");
storeArray[numStore-1]= inputSales.nextInt(); // store the value into the array

3. Increment numStore to 1

d. Close the scanner input class object - inputSales.close()

5. Create the Void Method called displayChart() that will display the bar chart for the 5 stores

a. Initialize the numStore to 1

b. Used the Do While Loop to perform the following iteration:

NOTE: The Do While Loop is a post-test loop which test the conditional expression AFTER each iteration
1. Store the value from the storeArray into the salesPer100 variable. Use numStore-1 for the array position

2. Display the store heading.

System.out.print("Store " + numStore + ": " );

3. Use a For Loop to perform the iteration of displaying the asterisk for the bar chart

System.out.print("*");

4. Insert a new line feed for the next store bar chart

System.out.println(); // insert line feed

5. Increment numStore to 1

D. Requirements for the MainApp Class:

1. Add comments (documentation)– Program Description, Author and Date

2. Create the instance of object called store from the BarChart class

3. Display the reporting header. Below is the code:

System.out.println();
System.out.println("Store's Performance Bar Chart");

4. Call the object’s Void method store.displayChart() to display the bar chart of each store

E. Test:

1. Save your Java code

2. Compile and run your Java program.

3. Verify there is no syntax, logical or run-time errors.

4. Use the following set of test data to determine if the application is running properly:

F. Submit your exercise in the Canvas Lab Exercise #14 Drop Box.

1. Submit the screen shot of the Eclipse Workbench window showing the Console output screen.
You can use Paint (save as JPG) or Word to paste the screenshot.

2. Zip up and submit the compressed BarChart subfolder that is in the Exercise-14 folder.
NOTE: Right click on the subfolder and select Send to “Compress Folder”. The file will have a file extension of .zip.