Error in my code that I cannot find.

/*  So the age old knock knock joke goes like this:

    Person A:  Knock Knock.
    Person B:  Who's there?
    Person A:  Banana
    Person B:  Banana who?
    ...as long as Person A has answered Banana the above repeats endlessly
    ...assuming the person answers Orange we'd see
    Person B:  Orange who?
    ...and then the punchline.
    Person A:  Orange you glad I didn't say Banana again?
    (It's a really bad joke that makes it sound like "Aren't you glad I didn't say Banana again?")

    Let's just assume the only two words passed in from the console from Person B are either banana or orange.
*/

// ====BEGIN PROMPTING CODE====
String who;
do{
// Person A asks:
console.printf("Knock Knock.\n");
// Person B asks and Person A's response is stored in the String who:
who = console.readLine("Who's there?  ");
  if(who.equalsIgnoreCase("banana"))
     {
       // Person B responds:
    console.printf("%s who?\n", who);
     }
}
while(who.equalsIgnoreCase("orange"));
  console.printf("orange you glad I didn't say banana?"); 


// ==== END PROMPTING CODE ====