Apex exercise

### Beginner's Guide to Creating Your First Apex Class

Welcome to your first step into the world of Apex! In this tutorial, we'll guide you through creating a simple Apex class. Apex is a strongly-typed, object-oriented programming language used in Salesforce, and it's similar to Java. Don't worry if you're new to coding—we'll keep it straightforward.

#### Step 1: Access Salesforce Developer Console

1. **Log in to Salesforce**: Use your Salesforce credentials to log in to your Salesforce instance.

2. **Open Developer Console**: Click on the gear icon (⚙️) in the upper right corner of Salesforce and select **Developer Console**.

#### Step 2: Create a New Apex Class

1. **Open the Apex Class creation window**:

   - In the Developer Console, go to the top menu and click on **File** > **New** > **Apex Class**.

2. **Name your class**:

   - A prompt will appear asking you to name your class. Enter a simple name like `HelloWorld` and click **OK**.

#### Step 3: Write Your First Apex Class

Now that you have your class file open, it's time to write some Apex code.

1. **Understand the basic structure**:

   - Apex classes typically start with the keyword `public` or `private`, followed by the class name and a set of curly braces `{}` that contain the body of the class.

2. **Write the code**:

   - Replace the default code in your class with the following:

  

 ```

apex

   public class HelloWorld {

       // This is a simple method that prints "Hello, World!" to the debug log

       public static void sayHello() {

           System.debug('Hello, World!');

       }

   }

   ```

   Here's what this code does:

   - `public class HelloWorld`: Declares a public class named `HelloWorld`.

   - `public static void sayHello()`: Declares a method named `sayHello` that doesn’t return any value (`void`). The `static` keyword means you can call this method without creating an instance of the class.

   - `System.debug('Hello, World!');`: This line prints "Hello, World!" to the debug log.

3. **Save your class**:

   - Press `Ctrl + S` (Windows) or `Cmd + S` (Mac) to save your class.

#### Step 4: Test Your Apex Class

Now that your class is created, you can run it to see the result.

1. **Execute the method**:

   - In the Developer Console, click on **Debug** > **Open Execute Anonymous Window**.

2. **Call your method**:

   - In the window that opens, type the following code:

   ```

apex

HelloWorld.sayHello();

   ```

3. **Execute the code**:

   - Click **Execute**. The code will run, and you should see the output