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.

===================================================================

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.

===================================================================

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.

===================================================================

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.

===================================================================

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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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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What is a method signature in Java? -Learn Java

What is a method signature in Java? -Learn Java

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In java, method signature consists of name of the method followed by argument types.

Example:

in java return type is not part of the method signature .Compiler will use method signature 

while resolving method calls.

   class Demo

  {

      public void m1(double d){ }

      public void m2(int i)    { }

      public static void main(String args[]){

         Demo d=new Demo();

         d.m1(11.2);

         d.m2(10);

         d.m3();  //CE

    }

  }

CE:cannot find symbol

symbol:method m3(double)

location:class Demo

Within  the same class we cant't take 2 method with the same signature otherwise we will 

get compile time error.

Example:

   public void methodOne() { }

   public int methodOne() { 

    

     return 10;

   }

Output:

Compile time error

methodOne() is already defined in Demo.

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Aggregation in Java: Definition and Examples -Learn Java

Aggregation in Java: Definition and Examples -Learn Java

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Without existing container object if there is a chance of existing contained objects

such type of relationship is called aggregation .

in aggregation objects have weak association.

Example:

Within a department there may be a chance of several professors will work whenever 

we are closing department still there may be a chance of existing department object the

 relationship between department and professor is called aggregation where the objects

 having weak association.

Example:

Composition in Java Example - Learn Java

Composition in Java Example - Learn Java

without existing container object if there is no chance of existing contained object

then the relation between container object and contained object is called composition 

which is a strong association.

Example:

Any university consists of several departments whenever university object destroys automatically 

all the department object will be destroys that is without existing dependent object hence there are associated and this relationship is called composition .

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HAS-A relationship in Java - Learn java

HAS-A relationship in Java - Learn java

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.

Example:-

class Engine
{
 // engine functionality
}
class Car
{
   Engine e=new Engine();
  //------------------------------;
  //------------------------------;
  //------------------------------;
}

NOTE:-

class car has-a engine reference.
The main dis-advantage of has-a relationship increases dependency between the
components and creates maintains problems.


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What is “tightly encapsulation” in Java? - Learn Java

What is “tightly encapsulation” in Java? - Learn Java

Encapsulation In Java With Realtime Example

A class is said to be tightly encapsulated. 
If and only if each and every variable of class declared as private.

And there is  no need to be worry about whether class contains corresponding 
getter and setter methods or not or whether these methods are declare as public 
or not.

Encapsulation In Java With Realtime Example:

Example:1
public class Account
  {
           private double balance;
           public double getBalance()
          {
                return balance;
          }
  }

Which of the following classes are tightly encapsulated

 public class A
 {
    private int x=11;(Valid)
 }
class B extends A
 {
    int y=20;(Invalid)
 }
 class C extends A
{
private int z=40;(Valid)
 }

Note : If the parent class is not tightly  encapsulated then  
child class will  not be tightly encapsulated.

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