Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Basics Perfecting the Prototype Looping until the value passes

i am stuck on this exercise 2 days any ideas what i miss?.

any ideas what is wrong?i am trying 2 days to solve this but i cant

/*  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.


// Person A asks:

do {console.printf("Knock Knock.\n");

// Person B asks and Person A's response is stored in the String who:
String who = console.readLine("Who's there?  ");
    console.printf("%s who?\n", who);
  console.printf("%s who?\n", who);}
      console.printf("%s who?\n",who);
      console.printf("%s you are glad i didnt say banana",who);


3 Answers

Ken Alger
Ken Alger
Treehouse Teacher


Welcome to Treehouse!

The way your code is written above, you are declaring your variable inside the do...while loop, that creates issues as you only want to declare the type once. With it being inside the loop, it is declared each time. It would, therefore, need to look similar to:

String who;

do {
// do something
} while (
// some condition exists

You are rather close, just walk through your code step by step and see what is happening and see if you can find the other issue you are having with the challenge. Take another look at the prompting code comments at the top to see how the user experience should be. As a hint, you have excess code after your while statement.

Post back if you are still stuck.


i do String who; out of the do loop and still same problem