From 00f3a75ac337764dbd85e93f66f249d36943276e Mon Sep 17 00:00:00 2001
From: David Stern <davidestern@icloud.com>
Date: Wed, 13 Aug 2025 11:50:34 +0200
Subject: [PATCH 1/2] David Stern

---
 .../java/com/booleanuk/core/Exercise.java     | 30 ++++++++++++++-----
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index d31a45c..962befd 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -1,9 +1,9 @@
 package com.booleanuk.core;
 
-import com.booleanuk.helpers.ExerciseBase;
-
 import java.util.ArrayList;
 
+import com.booleanuk.helpers.ExerciseBase;
+
 public class Exercise extends ExerciseBase {
     /*
         A List is like an array but provides a much easier interface to the items it stores, for example:
@@ -44,7 +44,9 @@ public ArrayList<Integer> getFavouriteNumbers() {
            second number contained in the list that is returned from getFavouriteNumbers
      */
 
-
+    public int getSecondNumber() {
+        return getFavouriteNumbers().get(1);
+    }
 
     /*
         TODO: 2. Create a method named multiply that accepts two parameters in this order:
@@ -56,7 +58,10 @@ public ArrayList<Integer> getFavouriteNumbers() {
          https://www.programiz.com/java-programming/library/arraylist/replaceall
      */
 
-
+    public ArrayList<Integer> multiply(ArrayList<Integer> numbers, int number) {
+        numbers.replaceAll(integer -> integer * number);
+        return numbers;
+    }
 
     /*
         TODO: 3. Create a method named isEmpty that accepts one parameter:
@@ -64,7 +69,9 @@ public ArrayList<Integer> getFavouriteNumbers() {
          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();
+    }
 
     /*
         TODO: 4. Create a method named addIngredient that accepts two parameters in this order:
@@ -73,7 +80,10 @@ 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> ingredients, String newIngredient) {
+        ingredients.add(newIngredient);
+        return ingredients;
+    }
 
     /*
         TODO: 5. Create a method named removeIngredient that accepts two parameters in this order:
@@ -82,7 +92,10 @@ 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> ingredients, String newIngredient) {
+        ingredients.remove(newIngredient);
+        return ingredients;
+    }
 
     /*
         TODO: 6. Create a method named containsIngredient that accepts two parameters in this order:
@@ -91,6 +104,9 @@ 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> ingredients, String ingredient) {
+        return ingredients.contains(ingredient);
+    }
 
 
 }

From 285c8f8c4a194c72de6572f8d91fe11ecfd35fb0 Mon Sep 17 00:00:00 2001
From: David Stern <davidestern@icloud.com>
Date: Wed, 13 Aug 2025 11:51:09 +0200
Subject: [PATCH 2/2] David Stern

---
 src/main/java/com/booleanuk/core/Exercise.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 962befd..4f04537 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -59,7 +59,7 @@ public int getSecondNumber() {
      */
 
     public ArrayList<Integer> multiply(ArrayList<Integer> numbers, int number) {
-        numbers.replaceAll(integer -> integer * number);
+        numbers.replaceAll(i -> i * number);
         return numbers;
     }