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Java Java Basics Perfecting the Prototype Looping until the value passes

Kevin Jervis
Kevin Jervis
2,600 Points
Posted by Kevin Jervis
Kevin Jervis
2,600 Points

Do While Loops

Hi guys. I'm a little stuck.Think I'm about 80% there :o(

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

2 Answers

Jonathan Grieve
MOD
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

Hi Kevin,

you're making a good start but there's a few issues I can see. First, you don't need to use an if statement or prompt the user a third time.

// I have initialized a java.io.Console for you. It is in a variable named console.
String response = console.readLine("Do you understand loops?");

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

You want to keep prompting as long as the answer from the user is "No". You can do the condition you'd otherwise write in an if statement after the while keyword.

I'll leave you with the last part of the challenge! :)

Steve Hunter
Steve Hunter
57,712 Points

Hi Jonathan,

Your code will prompt the user twice at the initial loop and comparing strings with == isn't best practice; .equals() is the preferred way, as the OP had done.

:wink: :+1:

Steve.

Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points
Jonathan Grieve
Jonathan Grieve
Treehouse Moderator 91,253 Points

equals didn't pass the code challenge when I tested it. That's what I expected, so the only other method is ==` which passed the challenge. Odd.

Steve Hunter
Steve Hunter
57,712 Points

Must've just been having a 'moment' - working fine now. Hey ho - not a problem.

Kevin Jervis
Kevin Jervis
2,600 Points
Kevin Jervis
Kevin Jervis
2,600 Points

That's awesome. I though I over complicated things. That's brilliant. Thanks Jonathan :o)

Steve Hunter
Steve Hunter
57,712 Points
Steve Hunter
Steve Hunter
57,712 Points

Hi Kevin,

You're pretty much there. Try something like this:

String response;

do{
  response = console.readLine("Do you understand loops?");
}while(response.equals("No")); // like what's in your if brackets

Make sense?

Steve.

Kevin Jervis
Kevin Jervis
2,600 Points
Kevin Jervis
Kevin Jervis
2,600 Points

Thanks for breaking that down for me Steve. Makes sense now. I appreciate the help :o)