Filtering and counting emails for customer engagement
A marketing team wants to count the number of customers with company email addresses (emails ending in @company.com) to send promotional offers. Streams allow us to efficiently filter and count these email addresses.
This exercise is part of the course
Input/Output and Streams in Java
Exercise instructions
- Convert the
emailslist into aStreamobject. - Filter only emails ending with
@company.com. - Count how many emails match the condition.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
import java.util.List;
import java.util.ArrayList;
import java.util.stream.Stream;
public class CompanyEmailFilter {
public static void main(String[] args) {
List emails = new ArrayList<>();
emails.add("[email protected]");
emails.add("[email protected]");
emails.add("[email protected]");
emails.add("[email protected]");
// Convert list to Stream
Stream stream = emails.________();
long count = stream
// Filter email ends with "@company.com"
.________(email -> email.endsWith("@company.com"))
// Count matching emails
.________();
System.out.println("Total company emails: " + count);
}
}