Code Correctness: String Comparison of Float

Comparing a floating-point value with a String object is unreliable and should not be done.

In order to compare a floating-point value to a String object, it must first be changed into a String object, typically via a function such as Double.toString(). Depending on the type and value of the floating-point variable, when converted to a String object, it could be "NaN", "Infinity", "-Infinity", have a certain amount of trailing decimal places containing zeroes, or may contain an exponent field. If converted to a hexadecimal String, the representation may differ greatly as well.

Example 1: The following compares a floating-point variable with a String.

  ...
  int initialNum = 1;
  ...
  String resultString = Double.valueOf(initialNum/10000.0).toString();
  if (s.equals("0.0001")){
    //do something
    ...
  }
  ...