Get startedGet started for free

Processing usernames for display

In a user management system, we need to display usernames stored in a database. Using Streams and .forEach(), we can efficiently process and print each username without using traditional loops.

This exercise is part of the course

Input/Output and Streams in Java

View Course

Exercise instructions

  • Convert the usernames list into a Stream object.
  • Print each element in the stream using a lambda expression.

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 UserDisplay {
    public static void main(String[] args) {
        List usernames = new ArrayList<>();
        usernames.add("Alice123");
        usernames.add("BobTheCoder");
        usernames.add("CharlieDev");
        usernames.add("David99");

        // Convert list to Stream
        Stream stream = usernames.____();
        // Print each username
        stream.____(name -> System.out.println("User: " + name));
    }
}
Edit and Run Code