author code and first one is mine.
                  
                  
                  2. There is no subject about believe. I just think type casting take more processing than directly using variable. Is it true?
                  
                  
                  3. As I told I mean better in efficiency not between black and white. 
                  
                  
                  4. *4 = &3
                  
                  
                
#2: type casting is not taking more processing time than an assignment. #3: rather than "better in efficiency" , try to use X has a (higher | lower) efficiency than Y , where *xy may be valid comparisson expresions.
#2. Just google "java type cast performance cost"
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