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Sunday, September 13, 2020

Xpanxion Mumbai Interview Questions latest 2020

 Interview Questions and Answers for Xpanxion 2020 Letest Questions & Answers 

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

Interview Question for Xpanxion Mumbai.




Que 1. What is dot operator ?

Ans:-    The dot operator(.) is used to access the
              instance varibles and methods of class
     objects.it is also used to access classes and
     sub-packages from a package.
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Que 2. List any five features of Java ?

Ans:-    Some features include Object Oriented, platform 
             Independent, Robust,interpreted,Multi-threaded.
===================================================================

Que 3. Why deletion in LinkList is fast than ArrayList ?

Ans:-     Deletion in linked list is fast because it involves only
               updating the next pointer in the node before the 
      deleted node and updating the previous pointer in 
              the node after the deleted node.
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Que 4. How do you decide when to use ArrayList and LinkList ?

Ans:-     if you need to frequently add and remove elements 
              from the middle of the list and only access the list
             elements sequentially, then LinkList should be used.
             if you need to support random access, without 
             inserting or removing elements from any place 
            other than the end, than ArrayList should be used.
===================================================================

Que 5. What are synchronized methods and synchronized statements ?

Ans:-     synchronized methods are methods that are used to control 
               access to an object.A thread only executes a synchronized method
              after has acquired the lock of the methods object or class. 
              Synchronized Statements are similar to synchronized methods.
             A synchronized statements can only be executed after a thread has 
             acquired the lock of the object or class referenced 
            in the synchronized statement.
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Que 6.  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.
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Que 7.  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.
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Que 8. 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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Que 9. What is Encapsulation ?

Ans:-     Binding a data and corresponding method in a single 
              unit is called encapsulation.If any class follows data 
      hiding and abstraction such type of class is called encapsulated class.
             ENCAPSULATION= ABSTRACTION+DATA HIDING
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