Finished Exercise

src/main/java/com/booleanuk/core/Exercise.java

@@ -43,7 +43,9 @@ public ArrayList<Integer> getFavouriteNumbers() {
         TODO: 1. Create a method named getSecondNumber that returns a whole number. It must return the
            second number contained in the list that is returned from getFavouriteNumbers
      */
-
+    public int getSecondNumber() {
+        return getFavouriteNumbers().get(1);
+    }
 
 
     /*
@@ -56,14 +58,21 @@ public ArrayList<Integer> getFavouriteNumbers() {
          https://www.programiz.com/java-programming/library/arraylist/replaceall
      */
 
-
+    public ArrayList<Integer> multiply(ArrayList<Integer> list, int multiplyBy) {
+        list.replaceAll(e -> (e*multiplyBy));
+        return list;
+    }
 
     /*
         TODO: 3. Create a method named isEmpty that accepts one parameter:
          - A list of strings
          The method must return a boolean that indicates whether the provided list is empty or not
      */
 
+    public boolean isEmpty(ArrayList<String> list) {
+        return list.isEmpty();
+    }
+
 
 
     /*
@@ -73,7 +82,10 @@ public ArrayList<Integer> getFavouriteNumbers() {
          The method must add the second parameter into the list provided and then return the list
      */
 
-
+    public ArrayList<String> addIngredient(ArrayList<String> list, String ingredient) {
+        list.add(ingredient);
+        return list;
+    }
 
     /*
         TODO: 5. Create a method named removeIngredient that accepts two parameters in this order:
@@ -82,7 +94,10 @@ public ArrayList<Integer> getFavouriteNumbers() {
          The method must remove the second parameter from the list and then return the list
      */
 
-
+    public ArrayList<String> removeIngredient(ArrayList<String> list, String ingredient) {
+        list.remove(ingredient);
+        return list;
+    }
 
     /*
         TODO: 6. Create a method named containsIngredient that accepts two parameters in this order:
@@ -91,6 +106,8 @@ public ArrayList<Integer> getFavouriteNumbers() {
          The method must return a boolean that indicates whether the second parameter exists in the provided list
      */
 
-
+    public boolean containsIngredient(ArrayList<String> list, String ingredient) {
+        return list.contains(ingredient);
+    }
 
 }