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

jacob jäger
jacob jäger
191 Points

I really dont understand this one, can someone explain it in another way, or send the code so i can look at it?

Now continually prompt the user in a do while loop. The loop should continue running as long as the response is No. Don't forget to declare response outside of the do while loop.

2 Answers

Johan Cederschiöld
Johan Cederschiöld
5,708 Points

Hi Jacob, You didn't specify what your problem with the challenge was. The thing with do while loops (compared to for or while loops) is that they always run, atleast once.

One of the important things is that variables you'll use as a boolean for a loop (i.e. the expression that needs to be accomplished for the loop to end) need to be instantiated and declared before and outside the loop.

My code would be:

String response = "";
do { response = console.readLine("Do you understand do while loops"); } while (response.equals("No"));

First we instantiate and declare the String variable to = "" (if this is not declared the loop will not work). In the challenge there's already a console declared by teamTreehouse (named console) and I'm using that. While the response equals "no" the loop will continue looping. Also - note that, for Strings, you can not use the == to check for equality.

Good luck.

jacob jäger
jacob jäger
191 Points

Thank you so much! It was verry helpful!

Aananya Vyas
Aananya Vyas
20,157 Points
// I have initialized a java.io.Console for you. It is in a variable named console.

String response;
do{
response = console.readLine("Do you understand do while loops?");

} while (response == "No");

There you go!