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Java Java Basics Perfecting the Prototype Looping until the value passes

Posted by Max Reinsch
Max Reinsch
5,740 Points

Last Java challenge (1 of 2)

I'm struggling to fully grasp the question being asked.

I've tried countless times but can't quite understand where I'm going wrong.

My latest attempt is as follows:

boolean who;

do {
console.printf("Knock Knock.\n");
String who = console.readLine("Who's there?  ");
  if (who.equals("banana")) {
  String who = console.readLine("Who's there?  ");} while (who.equals("banana")); 

console.printf(who);  
console.printf("%s who?\n", who);
console.printf("%s you glad I didn't say Banana again?")} 
}

I know I've gone a bit off the rails with this particular attempt, so just pointing me in the right direction would be great.

Craig Dennis

2 Answers

Robert Richey
Robert Richey
Courses Plus Student 16,352 Points

Hi Max,

The first step is to setup a do while loop.

do {
  // inside the loop
} while (condition);

So, with this code, we're trying to do something while some condition is true. Also, for this to work, the String variable who needs to be declared above the loop. Below, I'm declaring the variable 'who' of type String to initially hold an empty string. This loop will continue so long as the variable 'who' holds the value 'banana', so let's place that condition inside the while's parentheses.

String who = "";
do {
  // inside the loop
} while (who.equals("banana"));

Now, what needs to happen each time through the loop?

Max Reinsch
Max Reinsch
5,740 Points

I had an issue with what the question was asking; got there in the end!

Thanks Robert Richey.

Craig Dennis
STAFF
Craig Dennis
Treehouse Teacher
Craig Dennis
Craig Dennis
Treehouse Teacher

Max,

The loop should take care of checking about the banana bit, the if is unnecessary. Remember to use equalsIgnoreCase. It also looks like you might have an odd number of closing parenthesis.

You're close!

Max Reinsch
Max Reinsch
5,740 Points

I did the following (and finally succeeded):

 String who = "banana";
do {
console.printf("Knock Knock.\n");
who = console.readLine("Who's there?  ");
} while (who.equalsIgnoreCase("banana"));
console.printf("%s who?\n", who);

It turns out the solution was a lot simpler than expected; I just didn't quite get the question.

Cheers Craig Dennis.

Craig Dennis
Craig Dennis
Treehouse Teacher
Craig Dennis
Craig Dennis
Treehouse Teacher

Congrats Max Reinsch !!! New course dropping next week!

Max Reinsch
Max Reinsch
5,740 Points

Btw Craig Dennis, I have a request/recommendation.

How about making a list of projects for us to do, as in ask us to make a Java program/s to acheive a certain outcome. It would be a good way for us to get stuck in and experiment?

Cheers.