All the questions are really used in many interviews.
And all of them are collected by my friend - Hareluya, graduated from the university of Bristol.
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The difference between a static and non-static variable in a class definition.
A static variable is associated with the class
as a whole rather than with specific instancesof a class. Non-static
variables take on unique values with each object instance.
What are the differences between Java and PHP?
PHP and Java are completely different languages. PHP is only web based,
while Java is mainly client based (although can used on the web through
java applets). Both PHP and Java have their complete separate
interpreters, and they are both essentially guided towward different
purposes.
Java is mainly used for creating software that runs on the computer,
PHP is mainly used for creating websites.
About complexity of very standard algorithms.
N/A
The difference between Java and C++
From author: you can find many aspects of differences between them, but the following answer is enough for an interview.
Everything is an object in Java (Single root
hierarchy as everything gets derived from java.lang.Object). Java does
not have all the complicated aspects of C++ ( For ex: Pointers,
templates, unions, operator overloading, structures etc..) The Java
language promoters initially said "No pointers!", but when many
programmers questioned how you can work without pointers, the promoters
began saying "Restricted pointers." You can make up your mind whether
it’s really a pointer or not. In any event, there’s no pointer
arithmetic. There are no destructors in Java (automatic garbage
collection). Java does not support conditional compile (#ifdef/#ifndef
type). Thread support is built into java but not in C++. Java does not
support default arguments. There’s no scope resolution operator :: in
Java. Java uses the dot for everything, but can get away with it since
you can define elements only within a class. Even the method definitions
must always occur within a class, so there is no need for scope
resolution there either. There’s no "goto " statement in Java. Java
doesn’t provide multiple inheritance (MI), at least not in the same
sense that C++ does. Exception handling in Java is different because
there are no destructors. Java has method overloading, but no operator
overloading. The String class does use the + and += operators to
concatenate strings and String expressions use automatic type
conversion, but that’s a special built-in case. Java is interpreted for
the most part and hence platform independent.
Questions about Web Technologies like HTML, JavaScript.
N/A
Questions about sql server
N/A
How do you define inheritance and polymorphism?
This can be a confusing topic because one can argue that sharing method
attributes between a super or abstract class with a derived class could
be described by either Polymorphism or Inheritance. One significant
differerence could be illustrated as to when or under what circumstances
you would you use one or the other.
An ideal instance of using Inheritance would be when you want to create
an entirely new class, but wish to borrow a group of existing attributes
or methods resident in an existing Abstract or super Class, instead of
re-inventing the wheel. If you had an Abstract Class Carnivore and
wanted to create a subclass Cat, you could instantly inherit all the
methods that were common in Carnivore that applied to Cat without
writing new code.
Polymorphism could be best applied when you had an existing SubClass
that you wanted to modify or add a feature that could borrow a method
that existed in a higher class. Take the Cat subclass, which inherited
attributes from Carnivore, and you wanted to add the method Stalk, which
would generically describe how a carnivore approaches its prey. However
its implementation in Cat would detail the stealth it uses that are
unique to a Cat.
Questions about design concepts
N/A
Garbage collector in Java - How does it work
to be continued...