Please somebody solve this oops question

Question

class Value 

{

       public static void main(String [] s )

     {

     int i = 255;

byte b=(byte)i ;

char c = (char)b;

System.out.println("int value of char : " + (int) c);

}

 

}

 

 

Comments

what i think that if we keep on counting the values in the way 

128 integer value stands for -128 byte 

129 integer value stands for -127 byte .. 

but in this way it will take 15 minutes to solve if we will calculate like this.

Please tell how to solve quickly with a trick.