Interview Questions and Answers for Xpanxion 2020 Letest Questions & Answers 2020

 Interview Questions and Answers for Xpanxion 2020 Letest Questions & Ans

All The question of  Xpanxion Round 1st Clear. All type of core Java Question Asking in Xpanxion Company.

Que 1.   Give a few reasons for using java ?   

Ans:-           Built-in support for multi-threading ,socket communications,                                                                             and memory management. object oriented ,better portability                                                                             then other languages across operating system.support web based                                                                  applications,distributed applications.etc

              

              

Que 2. Tell Me Somthing About OOP'S Concept ?

Ans:-      OOP'S is called object oriented programming.
                  It is a programming  model in java.                                                                                                    OOP'S provide some concept to programming they are.
               1.      Abstraction.
              2.     Data Hiding.
              3.     Encapsulation.
              4.    Tightly encapsulation class.
              5.    IS-A Relationship(Inheritance).
              6    .HAS-A Relationship.
              7.    Method Singnature
              8    .Polymorphism
              9.   Static Control Flow.
            10.   Singleton Class.
            11.   Fectory Method.

Que 3. What is Polymorphism in Java ? 

Ans:-   Polymorphism is the ability to of an object to take 

on many forms.The most common use of polymorphism 

             in OOP occur when a parent class reference is used

to refer to a child class object.

Que 4. How many methods in Externalizable interface ?

Ans:-  There are two method in Externalizable interface.You have to implement these
            two methods in order to make your class externalizable. These two methods are
           1. readExternal().
           2. writeExternal().

Que 5. What is Iterator interface ?

Ans:-    The Iterator interface is used to step through the element of a Collection.

Que 6. What are native methods? How do you use them ?

Ans:-    Native methods are methods whose implementation is provided 
             in another programming language  such as C.The main objective of native
             method are to improve th performance of the system.

Que 7. What is HAS-A relationship in Java ?

Ans:-   1. HAS-A Relationship is also knows as composition(or) aggregation.
            2. There is no specific keyword to implement HAS-A relationship but mostly 
                 we can use new operator.
           3. The main advantage of  reusability.

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