Gender

import java.util.Scanner;
    
    public class gen
    {
        
        public static void main( String[] args ) 
        {
            
            Scanner keyboard = new Scanner(System.in);
            
            String Gender, FName, LName, Married;
            int Age;
            
            System.out.print( "What is your gender (Male or Female): " );
            Gender = keyboard.next();
            
            System.out.print( "First Name: " );
            FName = keyboard.next();
            
            System.out.print( "Last Name: " );
            LName = keyboard.next();
            
            System.out.print( "Age: " );
            Age = keyboard.nextInt();
            System.out.println();
            
            if ( Gender.equals("Female") && Age >= 20 ) 
            {
                System.out.print( "Are you married, " + FName + " (Yes or No)? " );
                Married = keyboard.next();
                System.out.println();
                
                if ( Married.equals("Yes") ) 
                {
                    System.out.println( "Then I shall call you Mrs. " + LName + "." );
                }
                
                if ( Married.equals("No") ) 
                {
                    System.out.println( "Then I shall call you Ms. " + LName + "." );
                }
            }
            
            
            if ( Age < 20 ) 
            {
                System.out.println( "Then I shall call you " + FName + "." );
            }
            
            if ( Gender.equals("Male") && Age >= 20 ) 
            {
                System.out.println( "Then I shall call you Mr. " + LName + "." );
            }
        
        }
    }
    

Picture of the output