How to find number of chinese characters?

[S. Ganapathy]

Hi All,
I am facing some problem in internationalizing chinese characters.

 String str = new String("请您惠顾赞助商", "Big5");
int numBytes = str.getBytes().length();
int numChars = str.toCharArray().length();
System.out.println(numBytes);
System.out.println(numChars); 

Both are displaying same output. That means number of bytes and number of characters are same. But each chinese character occupies 2 bytes, so number of characters should be half of number of bytes if all the characters added are chinese only.
Thanks in advance for the reply.
Regards,
Ganapathy, S.