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Thread: declaring in my mutator

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    Question declaring in my mutator




    So this is a hw assignment and I'm having a little trouble with it. I am a beginner (first programming class EVER) but I'm a quick learner so bare with me lol :-)

    The assignment is to make 2 classes (done that part) one called gorilla and the other called cat. In gorilla are as follows:
    -instance variables weight and name
    -accessors and mutators for both instance variables

    The problem I'm having because my prof wants us to make sure the mutator for weight CAN'T be set to a negative number


    So here's my mutator for weight for gorilla:

     
     public void setGweight(int x) {
            x != -0; //clearly Java DOES NOT agree with this statement
        }

    Any ideas on how to fix this?

    Thanks in advance! From one beginner to the pros and all...I can't wait to get better at this!


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    Default Re: declaring in my mutator

    make sure the mutator for weight CAN'T be set to a negative number
    What comparison would detect the negative number? Use an if statement.
    What is the code supposed to do if it detects a negative number?

    Java DOES NOT agree with this statement
    What if the full text of the error message?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: declaring in my mutator

    You know what...I totally forgot abt using an if statement! lol But she didn't say what the code is supposed to do if it detects a negative number, but to make sure that it CAN'T be a negative number (if that makes sense) after that part we are to use constructors to set the name and weight to default values... the full text of the error message says that
      public void setGweight(int x) {
            x != -0; //not a valid statement
        }

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    Default Re: declaring in my mutator

    I guess you could ignore making the change if the value is negative. Only change it if positive.
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    Default Re: declaring in my mutator

    But when I type
      public void setGweight(int x) {
           if  (x != -0) {
    return false; //error reads saying: cannot return a value from method whose result type is void--Unnecessary return statement
       }
     }

    But I don't know how else to say that.

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    Default Re: declaring in my mutator

    The method's return type is void which means that it does not return anything. So just use return without a value.

    The if statement should use test if the value passed to the method is negative which means less than 0.
    I don't think there is a -0 value.
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