c++ interview questions on garbage collection, java, cast,

(Last Updated On: May 12, 2010)

Garbage Collection:
If you were to implement a garbage collector in C++ how will you do it?

the easiest way is to use ref count list
check out

http://en.wikipedia.org/wiki/Garbage_collection_(computer_science)#Implementation_strategies
create a daemon thread

“What is multiGenerations Garbage Collection?”
Variable scope:
scope of variables – that has goto and multiple blocks in a program

casting
size_t
(Programming Language Test) When casting an object of a polymorphic class from a base class, which kind of cast executes only if it’s is valid?
choices were a number of different kinds of casts – dynamic, static, reinterpret, etc.
You should use dynamic cast. It returns a null pointer if it’s not valid. Reinterpret will give you a bad pointer since the cast will be pointing to the wrong part of the polymorphic object.

Also, it’s important to note the difference between using pointers vs references in the case of casts. In C++, if you use a pointer in a dynamic_cast<>() and it fails, the result is a null pointer. However, since you cannot have a null reference, dynamic casts need to be wrapped in try/catch blocks.
Datsa structure
Data Structures for handling high volume data

time complexities
java:
What are the trade-offs in C++ vs Java?

http://en.wikipedia.org/wiki/Comparison_of_Java_and_C%2B%2B

does java.io have for preventing malicious code from altering Serialized Objects?
What support does java.io have for preventing malicious code from altering Serialized Objects?
When using an ArrayList as the implementation for a list collection, what happens if adding an element exceeds the ArrayList’s capacity?

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