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Here is list of Questions and Answers covering all key area of Constructors & Garbage Collection topic of Java Programming:
Answer: Option D
Java handles deallocation of memory automatically, we do not need to explicitly delete an element. Garbage collection only occurs during execution of the program. When no references to the object exist, that object is assumed to be no longer needed, and the memory occupied by the object can be reclaimed.
Answer: Option B
Primitive widening uses the smallest method argument possible. (For Example if you pass short value to a method but method with short argument is not available then compiler chooses method with int argument). But in this case compiler will prefer the older style before it chooses the newer style, to keep existing code more robust. var-args method is looser than wider.
Answer: Option A
Java pass reference as value. passing the object reference, and not the actual object itself. Simply reassigning to the parameter used to pass the value into the method will do nothing, because the parameter is essentially a local variable.
Answer: Option D
A and B are wrong because they use the default access modifier and the access modifier for the class is public (remember, the default constructor has the same access modifier as the class). D is wrong. The void makes the compiler think that this is a method specification - in fact if it were a method specification the compiler would spit it out.