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Thread: Why won't this while loop work?

  1. #1
    Junior Member
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    Default Why won't this while loop work?

    Good day,

    I am trying to use this method but the literals "add", "subtract" or "divide" are not stopping the while loop from iterating. Why? Is there a better or correct way of doing this? Many thanks.

       public String getOperation()
       {
          String operatorSelect = Dialog.request("Please input add, subtract or multiply");
     
          while(!operatorSelect.equals("add") || !operatorSelect.equals("subtract") || !operatorSelect.equals("multiply"))
          {
             Dialog.alert("This is not a valid operator, please try again");
             operatorSelect = Dialog.request("Please input add, subtract or multiply");
          }
          return operatorSelect;
       }


  2. #2
    Member Fendaril's Avatar
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    Default Re: Why won't this while loop work?

    Hello trueblue and welcome to the java programming forums. May I see your full code?

  3. #3
    Super Moderator helloworld922's Avatar
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    Default Re: Why won't this while loop work?

    The fault is in your logic... this logic means that it would have to equals "add", "subtract", and "multiply" at the same time for the loop to terminate (impossible). Instead, you should use and logic.
     while(!operatorSelect.equals("add") && !operatorSelect.equals("subtract") && !operatorSelect.equals("multiply"))

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