Capgemini Java experienced interview questions

 Group A –

1> How many types of class loader are in there in Java? How do they work?

2> Name the methods of java.lang.Object class?

3> Tell me the new features introduced in jdk 1.8?

4> Tell me the new features introduced in jdk 1.7?

5> What is Stream api? What are benefits of using Stream Api?

6> Which all Collections classes you have used in your project?

7> How does HashSet work internally?

8> How does HashMap work internally?

9> How does ConcurrentHashMap work internally?

10> What is locking? What is Segment Level locking?

11> What are Wrapper classes? Why do we need Wrapper classes?

12> Code snippet

                  List l = null

                  System.out.println(l);  // what will be the output?

                  System.out.println(l.size());  // what will be the output

13> Code snippet

                  Byte a = 10;

                  Byte b = 5;

                  Byte c = a + b;

                  System.out.println(c);  // what will be the output?

14> int i = 012;

                  System.out.println(i); // What will be the output

15> What is the difference between Spring MVC and Spring Boot?

16> What is the difference between JPA and Hibernate?

17> When will you select Hibernate over JDBC?

 Group   B

  Have you written unit test cases? - Yes

1> Which all libraries you used apart from Junit?

2> Department has emplyees - What type of relation is this?

   Tell me the mandatory annotations those need to be used here?

3> What is the build tool you have used in your current project? - Gradle

4> How do you test your application before taking it to live?

5> Write the SQL query to find the second highest salary from employee table?

6> How do you write query in Hibernate? - Criteria and HQL both

7> My query returns around 1000 rows but I don't want to send them all to UI. How can I chunk them from Server side - I explained pagination. Next question was how can we do it through SQL?

1> How HashMap works?

2> Hibernate first level caching

3> Different annotations used in Spring boot

4> SQL query to find the second highest salary

5> Diiferent scope in Spring

6> What is Git hook

7> Bubble sort   Java code  or algorithms

8> What are the different ways available for sorting a list (same question was asked in the second round)

9> Difference between PUT and Patch

Most of the questions were related to process

1> Which SDLC you are following. I said Agile

2> Asked me many questions on Jira? How you are tracking defects?

3> How many nunmber of people in your team? What is your role?

4> Have you worked on component design? I said no. But I have done story analysis.

5> Which builkd tool you are using. I said Jenkins

[25/02, 2:06 pm] +91 83748 59783: Internal implementation in hashmap

What is hash map

What is bucket

Hash code method and implementation

Combination of inheritance and overloading programs

About all collections

Exception handling

Few programs in collections

 *What is the size of Boolean,

*Reverse integer,

* How to remove duplicates  from ArrayList,

* Hash map,

* Concerency hash map,

* Collections,

* Hibernate related questions,

* Mappings,

* Annotations,

* What types of controllers are used,

* What work you have done in current organization and previous organization.