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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 A
Choice A is the correct answer. The code does not compile because the constructor of class A is declared as private. This creates a problem when the subclass constructor makes an implicit super() call to the parent class constructor at the time B is instantiated. Since the code does not compile, all the other choices are incorrect. If the constructor of A had not been private, the output would have been 7.
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 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.