problem with constructors of Long and Float

[kevinn lee]

   class TestFloatConstructors{
public static void main(String args[]){
Float f1=new Float(23.5f);
Float f2=new Float(23.5);
Float f3=new Float("23.5f");//1
Float f4=new Float("23.5");
Float f5=new Float("012.5");
Long l=new Long("52L");//2
System.out.print(f1+" "+f2+" "+f3+" "+f4+" "+f5);
}
}

why doesnt line 1 one causes a runtime exception while line 2 does?
thanks

[Muhammad Ijaz Ahmed]

the reason is your are using "L" upper case, it should be lower case so try this

Long l=new Long("52l");  

[Prasad Kharkar]

Ijaj
this is not the case
for long and float numbers
L or l and F or f do not matter

[Muhammad Ijaz Ahmed]

@Prasad:
Thanks for correction. So does that mean we can't pass string either suffix is l or L. we have to pass numeric string?

[Henry Wong]

kevinn lee wrote:
why doesnt line 1 one causes a runtime exception while line 2 does?

The answer to "why" is probably lost in the bowels of history -- ie. I doubt if anyone knows. These are merely two different implementations. The Float implementation seems more robust, can deal with extra whitespaces, and follows the same definition of floating point as the JLS. However, the Long implementation seems to be less robust, and can only take digits -- no white space, no leading zero for octal, no hexidecimal syntax, etc.

Maybe they were done at different times. Maybe they were done by two different developers. Etc. Your guess would probably be as good as mine.

Henry

[kevinn lee]

Henry Wong wrote:

kevinn lee wrote:
why doesnt line 1 one causes a runtime exception while line 2 does?

The answer to "why" is probably lost in the bowels of history -- ie. I doubt if anyone knows. These are merely two different implementations. The Float implementation seems more robust, can deal with extra whitespaces, and follows the same definition of floating point as the JLS. However, the Long implementation seems to be less robust, and can only take digits -- no white space, no leading zero for octal, no hexidecimal syntax, etc.

Maybe they were done at different times. Maybe they were done by two different developers. Etc. Your guess would probably be as good as mine.

Henry

thank you henry

I came across this in a certain mock exam.Are we supposed to know things like this for the exam?