Java is the future !: Quiz of the Day | November 2, 2010

Wednesday, November 3, 2010

Quiz of the Day | November 2, 2010


What will happen when we try to compile the following code?


a. The compiler objects to line 3 comparing an Object with an array. 
b. The compiler objects to line 5 casting an Object to an array of int primitives. 
c. The compiler objects to line 11 comparing an Object to an array of Objects. 
d. It compiles without error.


Solution : Choice D is the correct answer. 

The "instanceof" operator tests the class of an object at runtime. It returns true if the type of the left-hand argument is the same as, or is some subtype of, the class or interface specified by the right-hand operand. Arrays are also objects, so they can be referred to by variables of type Object. Hence comparing Object type to array using instanceof is allowed. So choices A, B and C are incorrect.

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