Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Java Java Basics Perfecting the Prototype Looping until the value passes

Francesco Di Vito
Francesco Di Vito
4,502 Points

I recived an error for this exercise, but whitout specification

For this exercise i don't see the error and not recive the specification

KnockKnock.java
/*  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;
// Person A asks:
console.printf("Knock Knock.\n");

// Person B asks and Person A's response is stored in the String who:
do{
  who = console.readLine("Who's there?  ");
}while("banana");

// Person B responds:
console.printf("%s who?\n", who);

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

2 Answers

Hi Francesco Di Vito , in fact when I pasted your code in the Treehouse editor gave me an error

"JavaTester.java:110: error: incompatible types
}while("banana");
       ^
  required: boolean
  found:    String
1 error"

and that is because it is expecting a boolean but you gave it a string. You want to run that piece of code as long as the person types "banana" so you'll instead need

while(who.equalsIgnoreCase("banana"));

that equality function will return a boolean (true or false). Secondly you want to run this code everything A + B says

  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 so all of that has to be in the do-while loop.

I hope this clears things up for you.

Francesco Di Vito
Francesco Di Vito
4,502 Points

Yes, after some minutes i find this error. :-) Thanks for your reply

You are welcome :)