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Java Java Basics Perfecting the Prototype Looping until the value passes

what do i do

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Example.java
response = console.readLine("Do you understand do while loops?");
String response; 
while(true) { 
response = console.readLine("Do you understand do while loops?"); 
if (!response.equals("No")) { 
break; } }

1 Answer

Hi Mason,

First, you've declared response as being a String and get user input to a question using console.readLine(). That's the first stage of the challenge and it looks like this:

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

You've got beyond that bit and on to stage 2. Here, you need to create a do/while loop. The loop will always execute once and will continue to loop while the response equals "No". You need to amend the above response declaration to just create a variable but assign nothing to it. Then you create a do/while loop. That looks like:

String response;
do {
  // keep doing this
  response = console.readLine("Do you understand while loops?: ");
} while(condition);

The condition is a test of what the user has input. If they have entered "No", loop. Else don't ... So we need to test if response is "No". To compare strings, use the .equals() method. We can build this into the code:

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

That's stage 2 complete! Go figure out stage 3 and let me know how you get on.

I hope that helps,

Steve.