Capgemini experienced Java 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

 6>Internal implementation in hashmap

7>What is hash map

8>What is bucket

9>Hash code method and implementation

10>Combination of inheritance and overloading programs

11>About all collections

 12>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.