Numeric value of a Character

What is the difference between numerical value and unicode value of a character.
Character.getNumericalValue('a'); --> returns 10
Character.getNumericalValue('A'); --> returns 10
System.out.println(((int)'a')); ---> outputs 97
System.out.println(((int)'a')); ---> outputs 65
Can any one help me understand?

[url http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Character.html#getNumericValue(char)]the api is your friend :)

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