Function.andThen

package ch.claude_martin;

import java.util.Scanner;
import java.util.function.Function;

public class SomeClass {
    public static void main(String[] args) {
        Function<String, String> trim = String::trim;
        Function<CharSequence, Long> length = s -> s.codePoints().count();

        Function<String, Number> trimmedLength = trim.andThen(length);
        System.out.println("Type something and hit <enter>.");
        try (Scanner scanner = new Scanner(System.in)) {
            while (true) {
                String line = scanner.nextLine();
                Number len = trimmedLength.apply(line);
                if (0 == len.longValue())
                    break;
                System.out.format("The trimmed input was %d code points long.%n", len);
            }
        }
        System.out.println("Good Bye");
    }
}