logic - Inconsistencies with && and divide-by-zero error in Java -

I am starting Java, and I have to face some discrepancies why this works:

  if ((D! = 0) & amp; (n / d & lt; 3)) {count (A, D); }   
 But if I do this:  
  if ((n / d & lt; 3) & amp; amp; (D! = 0)) {count (A, D); }   
 I get this error:  
  Exception in thread "main" java.lang.ArithmeticException: / compute.main at zero (compute.java : 63) Java   
 
 
 Evaluates expressions using Java, this means that  & Amp; Amp; For , if the left expression is  false , then Java does not bother to evaluate the correct expression (since the full expression is guaranteed false) already  
 In your first example, if  d == 0 , then  d! = 0  is incorrect, so it's  n / d . In your second example, if  d == 0 , then  n / d & lt; 3  will divide you by zero error.