Assignemnt #49 and Gender Game

Code

           ///Name: Mark
    ///Period: 6
    ///Program Name: Gender Game
    ///File Name: gender.java
    ///Date finished: 10/13/15
    
    import java.util.Scanner;
    
    public class gender
    {
        public static void main(String[] args)
        {
            Scanner keyboard = new Scanner(System.in); 
            
            String fn, ln, yn="", mf;
            int age;
            
            System.out.print( "What is your gender? (M or F): " );
            mf = keyboard.next();
            System.out.print( "First Name: " );
            fn = keyboard.next();
            System.out.print( "Last Name: " );
            ln = keyboard.next();
            System.out.print( "Age: " );
            age = keyboard.nextInt();
            System.out.println( "" );
            
            if (mf.equals("M"))
            {
                if(age < 20 )
                {
                    System.out.println( "Then I shall call you " + fn + " " + ln + "." );
                }
                else
                {
                    System.out.println( "Then I shall call you Mr. " + ln );
                }
            }
            else if (mf.equals("F"))
            {
                 if(age > 20 )
                 {
                     System.out.print( "Are you married? (y or n) " );
                     yn = keyboard.next();
                     System.out.println( "" );
                 }
                    if (yn.equals("y"))
                    {
                        System.out.println( "Then I shall call you Mrs. " + ln );
                    }
                    else if (yn.equals("n"))
                    {
                        System.out.println( "Then I shall call you Ms. " + ln );
                    }
                else 
                {
                    System.out.println( "Then I shall call you " + fn + " " + ln );
                }
            }
        }
    }

    

Picture of the output