Nonsensical self computation(e.g., x & x)

• SA_FIELD_SELF_COMPUTATION
• SA_LOCAL_SELF_COMPUTATION

SA_FIELD_SELF_COMPUTATION:“This method performs a nonsensical computation of a field with another reference to the same field (e.g., x&x or x-x). Because of the nature of the computation, this operation doesn't seem to make sense, and may indicate a typo or a logic error. Double check the computation.” – 2013-12-09

SA_LOCAL_SELF_COMPUTATION:“This method performs a nonsensical computation of a local variable with another reference to the same variable (e.g., x&x or x-x). Because of the nature of the computation, this operation doesn't seem to make sense, and may indicate a typo or a logic error. Double check the computation.” – 2013-12-09

It makes no sense if we use the same variable (field, local variable or parameter) in both side of the following binary operators:

• -, /, %
• &&, ||, &, |, ^

In following part we have an example: <code Java> public class test {

  static int y=0;
  public static void findThis(int x) {
  y=x-x;  //cor118
        x=y-y;  //cor115
}

} </Code>

<code Java> public static void dontFindThis(int x) {

   int y=0;
   y=x+x;

} </Code>

FB = FindBugs, JT = JTransformer, Delta = JTransformer - FindBugs