Created default sentinal loop values and input menu options.

src/Assignments/A2/Substrings.java

@@ -37,16 +37,109 @@ Algorithm Design Block
 
 
 */
-
 package Assignments.A2;
 
+import java.util.Scanner;
+
 /**
  * Performs a brute force/exhaustive search for
  * how many substrings start with A and end with B.
  *
  * @author Jonathan Turner
+ * @version Spring 2024
  */
 public class Substrings {
 
+    /**
+     * Used as the main sentential loop and loops until the exit option is selected.
+     *
+     * @precondition none
+     * @postcondition none
+     */
+    public void start() {
+        int option = this.getOption();
+        while (option != 3) {
+            this.executeOption(option);
+            option = this.getOption();
+        }
+    }
 
+    /**
+     * Performs the action related to the option that was chosen.
+     *
+     * @precondition none
+     * @postcondition the action was performed.
+     *
+     * @param option the option that was chosen.
+     */
+    private void executeOption(int option) {
+        performAlgorithm();
+    }
+
+    /**
+     * Uses private fields to generate the number of subsets and comparisons.
+     *
+     * @precondition text != null && text != empty
+     * @postcondition the results are generated.
+     */
+    private void performAlgorithm() {
+
+    }
+
+    /**
+     * Prints out the menu of options, asks for an input, and if that input is invalid it prints an error and
+     * prompts the user again for the input.
+     *
+     * @precondition none
+     * @postcondition none
+     *
+     * @return the option selected
+     */
+    private int getOption() {
+        this.displayMenu(); // Prints out the menu
+
+        // Asks for the option and begins the loop until a valid option is gathered.
+        System.out.print("Enter option number: ");
+        int input = getIntegerInput();
+        while (input < 1 || input > 3) { // Compares it to the valid options available.
+            System.out.println("\nPlease enter a valid input.");
+            System.out.print("Enter option number: ");
+            input = getIntegerInput();
+        }
+        System.out.println();
+        return input;
+    }
+
+    /**
+     * Displays the menu options.
+     *
+     * @precondition none
+     * @postcondition the menu is displayed.
+     */
+    private void displayMenu() {
+        System.out.println("-----------------MAIN MENU--------------");
+        System.out.println("1. Read input string");
+        System.out.println("2. Run algorithm and display outputs");
+        System.out.println("3. Exit program");
+        System.out.println();
+    }
+
+    /**
+     * Gets user input to a number. A prompt must be provided prior to running this method.
+     * If the input was not an integer/(unable to be autoboxed), returns -1.
+     *
+     * @precondition none
+     * @postcondition none
+     *
+     * @return the integer input, if invalid -1.
+     */
+    protected int getIntegerInput() {
+        Scanner sc = new Scanner(System.in);
+        try {
+            String textInput = sc.nextLine();
+            return Integer.parseInt(textInput);
+        } catch (Exception e) {
+            return -1;
+        }
+    }
 }