ExceptionsActivity.java

//Program Name : ExceptionsActivity  - Student Starting Code
//Author : PBaker and Joshua Decker
//Date: 5/1/2022
//Description : arrays and catching various exceptions

package ch13;

import java.util.Scanner;
import java.util.InputMismatchException; //need to import this exception class

/* Step 1:  Starting code executes. Complete all new code as indicated by comments.  
 * 			Assume no bad input at this time. 
 *          Output at this point should resemble the "STEP 1 OUTPUT" listed below
 */

/* Step 2:  Now run code and enter 15 for the number of values to load in the array.  
 *          Will generate an exception.  Handle the exception. 
 *          System.out. a message indicating the issue.
 *          Check against the "STEP 2 OUTPUT" listed below
 */

/* Step 3:  Run code and enter 0 for the number of values to load in the array.
 *          Will generate an exception.  Handle the exception. 
 *          System.out. a message indicating the issue.
 *          Check against the "STEP 3 OUTPUT" listed below
 */

/* Step 4:  Run code and enter "hello" for the number of values to load in the array.
 *          Will generate an exception.  Handle the exception. 
 *          System.out. a message indicating the issue.
 *          Important: Will need to clear buffer with the following statement 
 *          inside the catch statement:  keyboard.nextLine();
 *          Check against the "STEP 4 OUTPUT" listed below
 */

/* Step 5:  Catch any unexpected exceptions. System.out. a message indicating the issue.
 * 			Check against the "STEP 5 OUTPUT" listed below
 */

/* Step 6:  Submit your completed code (ExceptionsActivity.java) with output included.  
 *          Submit a screenshot of code in development environment that shows entire workspace and code execution. (.png or.jpg)
 */

public class ExceptionsActivity {

	public static void main(String[] args)

	{
		int numOfValues = 0;
		int size = 10;
		int[] dataArray = new int[size];
		Scanner keyboard = new Scanner(System.in);
		String tryAgain = "N";

		System.out.println("Welcome to our Exceptions Activity");
		do {

			System.out.println("Loading the array");
			System.out.print("How many values do you want to load?");
			try {
				numOfValues = keyboard.nextInt();

				resetArray(dataArray);

				/** inside the loop fill the array with 0, 10, 20,30, 40, 50, 60.... **/
				for (int x = 0; x < numOfValues; x++) {
					dataArray[x] = x * 10;
				}
				System.out.println("My Array");
				System.out.println("-------");

				displayArray(dataArray);

				System.out.println("The average is: " + calculateIntAverage(dataArray, numOfValues));
			} 
			catch (InputMismatchException e) {
				System.out.println("\nOops that is not an integer");
				System.out.println(e);
				keyboard.nextLine();
			} 
			catch (ArrayIndexOutOfBoundsException e) {
				keyboard.nextLine();
				System.out.println("\nTried to write outside the array. Enter a number less than 11");
				System.out.println(e);
			} 
			catch (ArithmeticException e) {
				System.out.println("\nTried to divide by zero");
				System.out.println(e);
			} 
			catch (Exception e) {
				System.out.println("\nUnexpected Exception - Please call Tech Support");
				System.out.println(e);
			}

			System.out.print("\nTry again? Y or N: ");

			tryAgain = keyboard.next();
		} while (tryAgain.equalsIgnoreCase("Y"));

		keyboard.close();
		System.out.println("\nSee you later!");
	}

	/** complete this method so that the display looks like output below **/
	public static void displayArray(int[] someArray) {
		for (int i = 0; i < someArray.length; i++) {
			System.out.println("[" + i + "]: " + someArray[i]);
		}
	}

	/**
	 * calculate the integer average. average should be sum/num. both sum and num
	 * are int
	 **/
	public static int calculateIntAverage(int[] someArray, int num) {
		int sum = 0; // The sum of values in the array
		for (int value : someArray) {
			sum += value;
		}
		return sum / num;
	}

	/** load all elements of the array with 0 **/
	public static void resetArray(int[] someArray) {
		for (int i = 0; i < someArray.length; i++) {
			someArray[i] = 0;
		}
	}
}

/******
 * STEP 1 OUTPUT *************** Welcome to our Exceptions Activity Loading the
 * array How many values do you want to load?5 My Array ------- [0]: 0 [1]: 10
 * [2]: 20 [3]: 30 [4]: 40 [5]: 0 [6]: 0 [7]: 0 [8]: 0 [9]: 0 The average is: 20
 * 
 * Try again? Y or N: y Loading the array How many values do you want to load?7
 * My Array ------- [0]: 0 [1]: 10 [2]: 20 [3]: 30 [4]: 40 [5]: 50 [6]: 60 [7]:
 * 0 [8]: 0 [9]: 0 The average is: 30
 ****** 
 * STEP 2 OUTPUT *************** Try again? Y or N: y Loading the array How many
 * values do you want to load?15
 * 
 * Tried to write outside the array. Enter a number less than 11.
 * java.lang.ArrayIndexOutOfBoundsException: 10
 ****** 
 * STEP 3 OUTPUT *************** Try again? Y or N: y Loading the array How many
 * values do you want to load?0 My Array ------- [0]: 0 [1]: 0 [2]: 0 [3]: 0
 * [4]: 0 [5]: 0 [6]: 0 [7]: 0 [8]: 0 [9]: 0
 * 
 * Tried to divide by zero java.lang.ArithmeticException: / by zero
 ****** 
 * STEP 4 OUTPUT *************** Try again? Y or N: y Loading the array How many
 * values do you want to load?hello
 * 
 * Oops that is not an integer java.util.InputMismatchException
 * 
 * Try again? Y or N: n STEP 5 *************** See you later!

Output of this program: 

Welcome to our Exceptions Activity
Loading the array
How many values do you want to load?9
My Array
-------
[0]: 0
[1]: 10
[2]: 20
[3]: 30
[4]: 40
[5]: 50
[6]: 60
[7]: 70
[8]: 80
[9]: 0
The average is: 40

Try again? Y or N: y
Loading the array
How many values do you want to load?10
My Array
-------
[0]: 0
[1]: 10
[2]: 20
[3]: 30
[4]: 40
[5]: 50
[6]: 60
[7]: 70
[8]: 80
[9]: 90
The average is: 45

Try again? Y or N: y
Loading the array
How many values do you want to load?60

Tried to write outside the array. Enter a number less than 11
java.lang.ArrayIndexOutOfBoundsException: Index 10 out of bounds for length 10

Try again? Y or N: y
Loading the array
How many values do you want to load?0
My Array
-------
[0]: 0
[1]: 0
[2]: 0
[3]: 0
[4]: 0
[5]: 0
[6]: 0
[7]: 0
[8]: 0
[9]: 0

Tried to divide by zero
java.lang.ArithmeticException: / by zero

Try again? Y or N: y
Loading the array
How many values do you want to load?exception

Oops that is not an integer
java.util.InputMismatchException

Try again? Y or N: n

See you later!
 */