09 August, 2014

Experienced Java Interview questions asked by CGI

3+ Year experienced java questions asked by CGI.

       1)  Tell me about your self ?

    Ans : Just describe yourself with cool & confidence.
    
2) What you know about our company?

   Ans : Remember , it’s a very crucial question. You must do one R&D before going to interview. You should know about their product, technical stuffs they are working, market value of the company ane other important stuffs.

3) What is transient variable ?

   Ans : Transient variables are not serializable. It helps to avoid a variable to being serialization.

4) Write the code to initialize the inner class members.

Ans : Code here
public class InnerClassTest {

      class innerTest{
            private int age;
           
            public void display(){
                  System.out.println("Age="+age);
            }
      }
      /**
       * @param args
       */
      public static void main(String[] args) {
            InnerClassTest.innerTest innerObj=new InnerClassTest().new innerTest();
            innerObj.age=20;
            innerObj.display();
      }
}
 5) How to retrieve the elements from the collection write the code ?

Ans : Java provides certain interfaces by using that we can retrieve the elements from collection.Example – Iterator, ListIterator and Enumeration.

Example :- ArrayList data retrival

public class ArrayListRetrive {

      /**
       * @param args
       */
      public static void main(String[] args) {
            ArrayList<String> arList=new ArrayList<String>();
            arList.add("Java");
            arList.add("is");
            arList.add("Powerful!!!");
           
            //Retrive elements from ArrayList using Iterator
            Iterator iTer=arList.iterator();
            while(iTer.hasNext()){
                  System.out.println(iTer.next());
            }
      }

}
6) What is static and instance variables and methods ?

Ans : Static variables are per class but the instance variables are per object. All object share a single copy of static variable. In case of static method , no need of object creation for calling static method. The static method can directly call by using class name. Instance method need object for calling.
7) What is dynamic loading and static loading of java class ?

Ans : Dynamic class loading is by Class.forName() , which loads the class dynamically. Also you can use reflection for dynamic class loading. But, the static class loading is working by using ‘new’ keyword.

8) What type of loading is class.forname() ?

Ans : Its dynamically locate and loads the class.

9) What is Hibenate 3 best benfits ?

Ans : There are many benefits of hibernate. But the most benefits are below :-

1.     It reduces the developer effort to writing queries.
2.     Its easy to use with relational object which maps with java class and database relation.
3.     Query tuning is not required and it implements separates cache which is reason for better performance.

10) I have 100 tables and fields. I want to find one table name and  column names.  Write a quey .

Ans :  I have used mySQL database for this below query.
select TABLE_SCHEMA,TABLE_NAME,COLUMN_NAME from information_schema.COLUMNS where TABLE_NAME='EMPLOYEE';

 11) How to define a field name in hibernate using annotation ?

          Ans:- @Column  (Its provided by java persistent  API).

 12) What is Synchronization ?

          Ans:- Synchronization is a solution for concurrency issue. Java provide 'synchronized' keyword for implementing this.

  13) The most commonly used classes in collectionsn ?

Ans : ArrayList, LinkedList, HashTable, HashMap and ConcurrentHashMap, etc.





All the Best for Interview !!!   



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      08 August, 2014

      Tavant Technologies Java Interview Questions - Experienced

      Tavant Technologies
      Round 1:F2F
      1) Tell abt ur technical skills
      2) How to work with ajax applications?
      4) Asked about page factory design concepts.
      5) What are the collections u used in ur project?
      6) Framework explanation
      7) How to find no of rows or columns in a table?
      8) Diff b/w interface and abstract class?
      9) Various oops concepts used in the project?
      10) Roles and responsibilities.
      11) SQL queriesa) how to find duplicate records in a table b) Display the name of the emp who is getting         10th maximum salary
      12) Logical questions:
      i) A 2l bottle and a 4l bottle, By this u have to give me 3l of water? Is it possible? If yes tell me how
      ii) 8 balls, having same color and weight, out of that 1 is defective, a physical balance is given, using this how to find the defective one.

      Round 2
      1. What is run-time polymorphism? Explain with program? Where is it achieved?
      2. SQL queriesemp table fieldsename,eid,age
      a) Find the name of the emp who has 3rd max age
      b) Having clause and where clause
      3. Logical questions
      a) Cake in round shape, u have to cut the cake by 3 times only, and u have to divide into 8 equal pieces
      b) Using 5 zeros, how to make it as 120
      c) He gave me a paper, asked me to tore the paper once, to make 3 equal pieces


      Round 3- HR+ Managerial round

      1. Tell abt ur self
      2. Why u r looking for the job?
      3. What are the difficulties u faced in ur previous job?
      4. He is asking the same questions in different ways for 15 min
      5. Framework
      6. Difference b/w abstract class and interface.
      7. Scenario-an abstract class implements an interface, can the abstract class implement the methods of interface?
      8. From that he asked that do u perform auto it scripts in parallel execution?
      9. Difference B/w primary key and unique key
      10. Can unique key column hold null values? If yes how many null values?
      11. Use of super keyword, order of execution
      12. Collections u used in the project
      13. When array will be used ? and when array list will be used?



      All the Best for Interview !!!   



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      Follow for more details on Google+ and @Facebook!!!

      Find More Questions & Answers Below.
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