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Accenture Interview Questions and Answers -2

21. Does the order of public and static declaration matter in main() method?
No. It doesn’t matter but void should always come before main().
22. Can a source file contain more than one class declaration?
Yes a single source file can contain any number of Class declarations but only
one of the class can be declared as public.
23. What is a package?
Package is a collection of related classes and interfaces. package declaration
should be first statement in a java class.
24. Which package is imported by default?
java.lang package is imported by default even without a package declaration.
25. Can a class declared as private be accessed outside it’s package?
Not possible.
26. Can a class be declared as protected?
The protected access modifier cannot be applied to class and interfaces.
Methods, fields can be declared protected, however methods and fields in a
interface cannot be declared protected.
27. What is the access scope of a protected method?
A protected method can be accessed by the classes within the same package or
by the subclasses of the class in any package.
28. What is the purpose of declaring a variable as final?
A final variable’s value can’t be changed. final variables should be initialized
before using them.
29. What is the impact of declaring a method as final?
A method declared as final can’t be overridden. A sub-class can’t have the same
method signature with a different implementation.
30. I don’t want my class to be inherited by any other class. What should i do?
You should declared your class as final. But you can’t define your class as final, if
it is an abstract class. A class declared as final can’t be extended by any other
class.
31. Can you give few examples of final classes defined in Java API?
java.lang.String, java.lang.Math are final classes.
32. How is final different from finally and finalize()?
final is a modifier which can be applied to a class or a method or a variable. final
class can’t be inherited, final method can’t be overridden and final variable can’t
be changed.finally is an exception handling code section which gets executed whether an
exception is raised or not by the try block code segment.
finalize() is a method of Object class which will be executed by the JVM just
before garbage collecting object to give a final chance for resource releasing
activity.
33. Can a class be declared as static?
We can not declare top level class as static, but only inner class can be declared
static.
public class Test
{
static class InnerClass
{
public static void InnerMethod()
{ System.out.println(“Static Inner Class!”); }
}
public static void main(String args[])
{
Test.InnerClass.InnerMethod();
}
}
//output: Static Inner Class!
34. When will you define a method as static?
When a method needs to be accessed even before the creation of the object of the
class then we should declare the method as static.
35. What are the restriction imposed on a static method or a static block of code?
A static method should not refer to instance variables without creating an
instance and cannot use “this” operator to refer the instance.
36. I want to print “Hello” even before main() is executed. How will you acheive
that?
Print the statement inside a static block of code. Static blocks get executed when
the class gets loaded into the memory and even before the creation of an object.
Hence it will be executed before the main() method. And it will be executed only
once.
37. What is the importance of static variable?
static variables are class level variables where all objects of the class refer to the
same variable. If one object changes the value then the change gets reflected in
all the objects.
38. Can we declare a static variable inside a method?
Static varaibles are class level variables and they can’t be declared inside a
method. If declared, the class will not compile.
39. What is an Abstract Class and what is it’s purpose?
A Class which doesn’t provide complete implementation is defined as an abstract
class. Abstract classes enforce abstraction.
40. Can a abstract class be declared final?
Not possible. An abstract class without being inherited is of no use and hence will
result in compile time error.
41. What is use of abstract variable?
Variables can’t be declared as abstract. only classes and methods can be
declared as abstract.
42. Can you create an object of an abstract class?
Not possible. Abstract classes can’t be instantiated.
43. Can a abstract class be defined without any abstract methods?
Yes it’s possible. This is basically to avoid instance creation of the class.
44. Class C implements Interface I containing method m1 and m2 declarations.
Class C has provided implementation for method m2. Can i create an object of
Class C?
No not possible. Class C should provide implementation for all the methods in the
Interface I. Since Class C didn’t provide implementation for m1 method, it has to
be declared as abstract. Abstract classes can’t be instantiated.
45. Can a method inside a Interface be declared as final?
No not possible. Doing so will result in compilation error. public and abstract are
the only applicable modifiers for method declaration in an interface.
46. Can an Interface implement another Interface?
Intefaces doesn’t provide implementation hence a interface cannot implement
another interface.
47. Can an Interface extend another Interface?
Yes an Interface can inherit another Interface, for that matter an Interface can
extend more than one Interface.
48. Can a Class extend more than one Class?
Not possible. A Class can extend only one class but can implement any number of
Interfaces.
49. Why is an Interface be able to extend more than one Interface but a Class can’t
extend more than one Class?
Basically Java doesn’t allow multiple inheritance, so a Class is restricted to
extend only one Class. But an Interface is a pure abstraction model and doesn’t
have inheritance hierarchy like classes(do remember that the base class of all
classes is Object). So an Interface is allowed to extend more than one Interface.
50. Can an Interface be final?
Not possible. Doing so so will result in compilation error.
51. Can a class be defined inside an Interface?
Yes it’s possible.

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