Technical Interview Questions
Oracle Interview Questions
J2EE Interview Questions
Object Oriented Interview Questions and Answers
Does a class inherit the
constructors of its superclass?
A class does not inherit constructors from any of its super classes.
If a class is declared
without any access modifiers, where may the class be accessed?
A class that is declared without any access modifiers is said to have
package access. This means that the class can only be accessed by other
classes and interfaces that are defined within the same package.
What is Python and what
is scope of Python?
Python is an interpreted, interactive, object-oriented programming language.
It is often compared to Tcl, P e r l, Scheme or Java.
Python combines remarkable power with very clear syntax. It has modules,
classes, exceptions, very high level dynamic data types, and dynamic typing.
There are interfaces to many system calls and libraries, as well as to
various windowing systems (X11, Motif, Tk, Mac, MFC, wxWidgets). New
built-in modules are easily written in C or C++. Python is also usable as an
extension language for applications that need a programmable interface.
The Python implementation is portable: it runs on many brands of UNIX, on
Windows, OS/2, Mac, Amiga, and many other platforms.
The Python implementation is copyrighted but freely usable and
distributable, even for commercial use.
Scope of Python :
A scope is a textual region of a Python program where a name space is
directly accessible. “Directly accessible'’ here means that an unqualified
reference to a name attempts to find the name in the name space.
Although scopes are determined statically, they are used dynamically. At any
time during execution, exactly three nested scopes are in use (i.e., exactly
three name spaces are directly accessible): the innermost scope, which is
searched first, contains the local names, the middle scope, searched next,
contains the current module’s global names, and the outermost scope
(searched last) is the name space containing built-in names.
Usually, the local scope references the local names of the (textually)
current function. Outside of functions, the local scope references the same
name space as the global scope: the module’s name space. Class definitions
place yet another name space in the local scope.
It is important to realize that scopes are determined textually: the global
scope of a function defined in a module is that module’s name space, no
matter from where or by what alias the function is called. On the other
hand, the actual search for names is done dynamically, at run time —
however, the language definition is evolving towards static name resolution,
at “compile'’ time, so don’t rely on dynamic name resolution! (In fact,
local variables are already determined statically.)
A special quirk of Python is that assignments always go into the innermost
scope. Assignments do not copy data — they just bind names to objects. The
same is true for deletions: the statement “del x” removes the binding of x
from the name space referenced by the local scope. In fact, all operations
that introduce new names use the local scope: in particular, import
statements and function definitions bind the module or function name in the
local scope. (The global statement can be used to indicate that particular
variables live in the global scope.)
What is the difference
between shadow and override?
Overriding is used to redefines only the methods, but shadowing redefines
the entire element.
What is multithreading?
Multithreading is the mechanism in which more than one thread run
independent of each other within the process.
What are inner class and
Inner class : classes defined in other classes, including those defined in
methods are called inner classes. An inner class can have any accessibility
including private. Anonymous class : Anonymous class is a class defined
inside a method without a name and is instantiated and declared in the same
place and cannot have explicit constructors.
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