In this Training, you create an EmailManager class that encapsulates the logic to send confirmation emails to the conference speakers.

Step 1: Create the EmailManager class

1.Click  and select Developer Console.

2.In the Developer Console, click File > New > Apex Class. Specify EmailManager as the class name and click OK.

3.Paste the following into the Developer Console.

public with sharing class EmailManager{
public void sendMail(String [] addresses, String [] subjects, String [] messages) {
Messaging.SingleEmailMessage [] emails = new Messaging.SingleEmailMessage[]{};
Integer totalMails = addresses.size();
for(Integer i=0; i < totalMails; i++){
Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage();
email.setSubject(subjects[i]);
email.setToAddresses(new List<String> { addresses[i] });
email.setPlainTextBody(messages[i]);
emails.add(email);
}
Messaging.sendEmail(emails);
}
}

4.Click File > Save to save the file.

Step 2: Send an Email

In this step, you test the EmailManager class by sending an email from the Developer Console. Later in this project, you integrate the EmailManager class with other parts of the application to automate the process of sending confirmation emails.

1.In the Developer Console, click Debug > Open Execute Anonymous Window.

2.Type the following Apex code (provide your own email address).

String address = ‘YOUR_EMAIL_ADDRESS’;
String subject = ‘Speaker Confirmation’;
String body = ‘Thank you for speaking at the conference.’;
String[] addresses = new String[]{},
subjects = new String[]{},
messages = new String[]{};
addresses.add(address);
subjects.add(subject);
messages.add(body);
EmailManager em = new EmailManager();
em.sendMail(addresses, subjects, messages);

4.Click the Execute button.

5.Check your email. You should have received a confirmation email.

Step 3: Using a Static Method

Since EmailManager is a utility class that doesn’t work with instance-specific variables, you can make the sendMail() method static.

1.In the Developer Console, open the EmailManager class.

2.To turn sendMail() into a static method, change its signature as follows (add the static keyword).

public static void sendMail(String[] addresses, String[] subjects, String[] messages) {

3.Save the file.

4.Go back to the Execute Anonymous Window (Debug > Open Execute Anonymous Window).

5.Modify the Apex code to invoke sendMail() statically (provide your own email address).

String address = ‘YOUR_EMAIL_ADDRESS’;
String subject = ‘Speaker Confirmation’;
String body = ‘Thank you for speaking at the conference.’;
String[] addresses = new String[]{},
subjects = new String[]{},
messages = new String[]{};
addresses.add(address);
subjects.add(subject);
messages.add(body);
EmailManager.sendMail(addresses, subjects, messages);

Click Execute and check your email.

Please refer the following link to learn more about Apex class programming How to get geolocation through apex class 

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This training will be very useful to learn about Apex class creation in salesforce.