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Thread: unexpected results to simple program

  1. #1
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    Default unexpected results to simple program

    I got this off af a tutorials page. For some reason one of the values is wrong or unexpected.
    public class IdentifyMyParts {
        public static int x = 7; 
        public int y = 3; 
     
     
    public static void main(String[] args) {
     
      IdentifyMyParts a = new IdentifyMyParts();
      IdentifyMyParts b = new IdentifyMyParts();
      a.y = 5;
      b.y = 6;
      a.x = 1;
      b.x = 2;
      System.out.println("a.y = " + a.y);
      System.out.println("b.y = " + b.y);
      System.out.println("a.x = " + a.x);
      System.out.println("b.x = " + b.x);
      System.out.println("IdentifyMyParts.x = " + IdentifyMyParts.x);
     
    }
     
    }

    the output:
    jay@linux-9mi3:~/programming> java IdentifyMyParts
    a.y = 5
    b.y = 6
    a.x = 2
    b.x = 2
    IdentifyMyParts.x = 2


  2. #2
    Super Moderator curmudgeon's Avatar
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    Default Re: unexpected results to simple program

    The reason I ask is because your output looks completely correct and expected to me. I wonder if you are confused as to the concept of static fields, but I have to await your answer to know with certainty. Know this though, static fields are not fields of the object, but rather fields of the *class*. So if you change the value of a static field for an object, you change it for all. It is for this reason that you shouldn't try to access static fields on instance variables but rather on the class itself. It's much more clear doing it this way.

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    Super Moderator curmudgeon's Avatar
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    Default Re: unexpected results to simple program

    What part of your output is "wrong or unexpected"?

    --- Update ---

    The reason I ask is because your output looks completely correct and expected to me. I wonder if you are confused as to the concept of static fields, but I have to await your answer to know with certainty. Know this though, static fields are not fields of the object, but rather fields of the *class*. So if you change the value of a static field for an object, you change it for all. It is for this reason that you shouldn't try to access static fields on instance variables but rather on the class itself. It's much more clear doing it this way.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: unexpected results to simple program

    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
    Super Moderator curmudgeon's Avatar
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    Default Re: unexpected results to simple program

    Why did you abandon this thread?

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