Float and Double.valueOf(String) don't throw NumberFormatException.

Name: aaC67449 Date: 12/03/97



Float.valueOf(String),
Double.valueOf(String),
Float(String) and
Double(String)
accept integer literals (i.e. literals without decimal point).
According to the JLS (20.9.17, 20.10.16), the NumberFormatException
shold be thrown.

JLS 20.9.17:
"
20.9.17 public static Float valueOf(String s)
throws NullPointerException, NumberFormatException

The string s is interpreted as the representation of a floating-point value and a Float object representing that value is created and returned.

If s is null, then a NullPointerException is thrown.

Leading and trailing whitespace (?20.5.19) characters in s are ignored. The rest of s should constitute a FloatValue as described by the lexical syntax rules:

    FloatValue:

            [Sign] Digits . [Digits] [ExponentPart]

            [Sign] . Digits [ExponentPart]

where Sign, Digits, and ExponentPart are as defined in ?3.10.2. If it does not have the form of a FloatValue, then a NumberFormatException is thrown. Otherwise, it is regarded as representing an exact decimal value in the usual "computerized scientific notation"; this exact decimal value is then conceptually converted to an "infinitely precise" binary value that is then rounded to type float by the usual round-to-nearest rule of IEEE 754 floating-point arithmetic. Finally, a new object of class Float is created to represent this float value.

Note that neither F nor f is permitted to appear in s as a type indicator, as would be permitted in Java source code (?3.10.1).

"
-------------Example ---------------

public class Test {

public static void main( String argv[] ) {
 try {
     Float.valueOf("1");
     System.out.println("FAILED. No NumberFormatException.");
 }catch(NumberFormatException e) {
    System.out.println("PASSED");
 }

 try {
     Float.valueOf("1234");
     System.out.println("FAILED. No NumberFormatException.");
 }catch(NumberFormatException e) {
    System.out.println("PASSED");
}
 
}

---------Output from the test---------------------
FAILED. No NumberFormatException.
FAILED. No NumberFormatException.
--------------------------------------------------



======================================================================

Name: rmT116609 Date: 09/19/2002


DESCRIPTION OF THE PROBLEM :
Long.valueOf(" 12 "); throws NumberFormatException, Same with Integer

 

Double.valueOf(" 12 "); does a trim and doesn't throw anything. Same as Float.


EXPECTED VERSUS ACTUAL BEHAVIOR :
Consistency, either trim the string in the valueOf method all-the-time or don't trim.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class NumberTest
{

   public static void main(String[] args)
   {

      String numberString = " 20 ";
      try
      {
         System.out.println(Long.valueOf(numberString));
      }
      catch (NumberFormatException npe)
      {
         System.out.println("caught number format expection");
      }
      try
      {
          System.out.println(Double.valueOf(numberString));
      }
      catch (NumberFormatException npe)
      {
         System.out.println("caught number format expection");
      }

   }
}
---------- END SOURCE ----------
(Review ID: 164754)
======================================================================