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

Posted by Urito SG
Urito SG
684 Points

How to make while loops?

I don't understand how to make while loops. I've watched the video twice and still don't get it.

Example.java 
// I have initialized a java.io.Console for you. It is in a variable named console.
  String response = console.readLine("Do you understand do while loops?");
  boolean isInvalid;
do {
  isInvalid = (response.equals("No");
} while (isInvalid);

1 Answer

Tomáš Kuruc
Tomáš Kuruc
7,711 Points
Tomáš Kuruc
Tomáš Kuruc
7,711 Points

Forexample if you don't know thah condition is true but you need run block of code least onece then you use do while loop. Let's see: in code above you can see variable isInvalid. You need find out if its value is true or false. You let run block of code least once. if response is equals to "No" then var isInvalid is set to true and your while loop will be continued. You should watch a workshop feeling loopy with Java: https://teamtreehouse.com/library/feeling-loopy-with-java