單項(xiàng)選擇題

1. public class Test { 
2. public static void main (String []args)  { 
3. unsigned byte b = 0; 
4. b--; 
5.    
6.   } 
7. }  
What is the value of b at line 5?()  

A. -1
B. 255
C. 127
D. Compilation will fail.
E. Compilation will succeed but the program will throw an exception at line 4.

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