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Question 1

class ?

Answer 1

Collection of objects is called class.

Question 2

object ?

Answer 2

• An Object can be defined as an instance of a class.
  or
• a real-world entity

Question 3

Inheritance ?

Answer 3

process of one class acquiring the properties of another classes

Question 4

Polymorphism in Java ?

Answer 4

Polymorphism is the ability of an object to take many forms.

Question 5

Abstraction ?

Answer 5

hiding the unnecessary details

Question 6

Encapsulation ?

Answer 6

Encapsulation in Java is a mechanism to wrap up variables(data) and methods(code) together as a single unit.

Question 7

Why is multiple inheritance not supported in Java?

Answer 7

?

Question 8

Can we override the static method?

Answer 8

NO.
Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called.

Question 9

Can we overload the main method?

Answer 9

Yes, We can overload the main method in java but JVM only calls the original main method, it will never call our overloaded main method.

Question 10

A Java Constructor returns a value but, what?

Answer 10

There are no “return value” statements in the constructor, but the constructor returns the current class instance.

Question 11

Can we overload a static method?

Answer 11

Yes. We can overload static methods. But remember that the method signature must be different. For example, consider the following Java program.

Question 12

Constructors?

Answer 12

• It is used to initialize the object.

- It calls a default constructor if there is no constructor available in the class.

Question 13

static vs final?

Answer 13

• static is used to define the class member that can be used independently of any object of the class
• while final is used to declare a constant variable or a method that cannot be overridden or a class that cannot be inherited.

Question 14

Multiple inheritance in java?

Answer 14

Java does not support Multiple inheritance.