Question

Java programming:

The feedback I received "responds badly to bad input. Fix 2"

Original question:

Write a program that creates a small (6-10) array of ints. Display your array elements, all on one line, using a foreach loop. In a try block, prompt the user to enter an index for the array and attempt to print the element with that index. Follow the try block with two catch blocks; one that detects an index out of bounds, and another that catches other bad inputs. Make sure the catch blocks are properly ordered (see page 464). Include a finally block that reports the size of the array. See Sample Runs below.

Sample Run 1

12 15 24 5 9 16

Enter any index of your array 5

The element at index 5 is 16

The array size is 6

Sample Run 2

12 15 24 5 9 16

Enter any index of your array 9

Error. Array index was out of bounds

The array size is 6

Sample Run 3

12 15 24 5 9 16 12 22

Enter any index of your array three

Bad input. Try again

The array size is 8

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My code:

import java.util.*;

public class Program2 {

   public static void main(String[] args) {
       Scanner input = new Scanner(System.in);

       int[] theElements = { 12, 15, 24, 5, 9, 16 };

       int j = 1, index = -1;

       String select;

       while (true) {
           System.out.println("Sample Run " + j);

           System.out.print(Arrays.toString(theElements));
           System.out.print("\nEnter any index of your array ");
           try {
               index = input.nextInt();

           } catch (InputMismatchException ex) {
               System.out.print("Bad input. Try again");
           }
           // for each loop
           for (int i : theElements) {

               if (index > theElements.length || index < 0) {
                   System.out.print("\nError. Array index was out of bounds");
               } else {

                   System.out.print("\nThe element at index " + index + " is " + theElements[index]);
                   System.out.print("\nThe array size is " + theElements.length);
                   break;
               }

           }
           j++;
           System.out.print(" want to continue (y/n) ");
           select = input.next();

           if (select == "y" || select == "Y") {
               continue;
           } else {

               break;
           }

       }

   }

}

Answer 1

import java.util.*;

public class Program2 {

  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);

    int[] theElements = { 12, 15, 24, 5, 9, 16 };

    int index = -1;
    
    System.out.print(Arrays.toString(theElements));
    System.out.print("\nEnter any index of your array ");
    try {
      index = input.nextInt();

    } catch (InputMismatchException ex) {
      System.out.print("Bad input. Try again");
    }
    // for each loop
    for (int i : theElements) {

      if (index > theElements.length || index < 0) {
        System.out.print("\nError. Array index was out of bounds");
      } else {

        System.out.print("\nThe element at index " + index + " is " + theElements[index]);
        System.out.print("\nThe array size is " + theElements.length);
        break;
      }

    }

  }

}