04. Personal Titles

import java.util.Scanner;

public class  PersonalTitles {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double age = Double.parseDouble(scanner.nextLine());
        String gender = scanner.nextLine();

        if (gender.equals("m")) {
            if (age < 16) {
                System.out.println("Master");
            } else {
                System.out.println("Mr.");
            }
        } else {
            if (age < 16) {
                System.out.println("Miss");
            } else {
                System.out.println("Ms.");
            }
        }
    }
}

Решение с тернарен оператор:

import java.util.Scanner;

public class  PersonalTitles {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double age = Double.parseDouble(scanner.nextLine());
        String gender = scanner.nextLine();

        System.out.println(age >= 16 ? (gender.equals("f") ? "Ms." : "Mr.") : (gender.equals("f") ? "Miss" : "Master"));
    }
}