&& and & operator in JAVA

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  Aarti15y agoPosted Nov 17, 2011, 3:56 AM

  && operator checks the first condition if it find it false then it goes for second one. But & operator checks the both condition irrespective of bollean value of first condtion. So if && operator is replaced with & operator it will give the null pointer exception in the given example
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  Vulpes15y agoPosted Nov 9, 2011, 4:23 AM

  Yes, Javeed's right.

  
  

  The difference between the & and && operators is that & always evaluates both operands, whereas && only evaluates the second operand if the first one is true. For this reason the latter is sometimes referred to as a 'short-circuiting' operator.

  
  

  So, if you use & and 'a' is null making the first operand false, the second operand will still be evaluated and will throw an exception for the reason Javeed stated.
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  Javeed M Shaikh15y agoPosted Nov 8, 2011, 7:21 PM

  may be error out since you cannot do length on a variable who's value is null.