Salesforce Apex Code Send mail

public void sender(String debugMessage){
Messaging.SingleEmailMessage message = new Messaging.SingleEmailMessage();
message.toAddresses = new String[] { ‘alessandro@xxx.it’ };
message.subject = ‘Debug’;
message.plainTextBody = debugMessage;
Messaging.SingleEmailMessage[] messages = new List {message};
Messaging.SendEmailResult[] results = Messaging.sendEmail(messages);
}