Interview Questions and Answers for 'Nucleu' | Search Interview Question

Interview Questions and Answers for 'Nucleu' - 8 question(s) found - Order By Newest

Almost sure to be asked in every company using any Dependency Injection framework ( Spring, Guice etc )

Q1. What is Dependency Injection or IOC ( Inversion of Control ) ?

Ans. It is a Design Pattern that facilitates loose coupling by sending the dependency information ( object references of dependent object ) while building the state of the object. Objects are designed in a manner where they receive instances of the objects from other pieces of code, instead of constructing them internally and hence provide better flexibility.

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_{Like Discuss Correct / Improve design patterns ioc ( Inversion of Control ) dependency injection Asked in 83 Companies intermediate frequent}

Q2. What is JDBC? Describe the steps needed to execute a SQL query using JDBC.

Database

Ans. The JDBC is a pure Java API used to execute SQL statements. It provides a set of classes and interfaces that can be used by developers to write database applications.

The steps needed to execute a SQL query using JDBC:

1. Open a connection to the database.
2. Execute a SQL statement.
3. Process th results.
4. Close the connection to the database.

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_{Like Discuss Correct / Improve java jdbc db connectivity Asked in 2 Companies basic frequent}

Very frequently asked if being interviewed for hibernate. Frequently asked in Tata Consultancy (TCS) and Overstock.com

Q3. Difference between load and get ?

Hibernate

Ans. If id doesnt exist in the DB load throws an exception whereas get returns null in that case.get makes the call to DB immediately whereas load makes the call to proxy.

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_{Like Discuss Correct / Improve hibernate Asked in 16 Companies basic frequent}

Very Frequently asked to Senior Software Engineers or Developers.

Q4. Describe some of the Design Patterns you have used ?

Design

Ans. [Open Ended Answer]

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_{Like Discuss Correct / Improve design patterns Asked in 17 Companies intermediate frequent}

Frequently asked these days as there are major changes in Java 8.

Q5. What are new features introduced with Java 8 ?

Core Java

Ans. Lambda Expressions , Interface Default and Static Methods , Method Reference , Parameters Name , Optional , Streams, Concurrency.

Sample Code for Lambda

Sample Code for interface default

Sample Code for Optional

Sample Code for Streams

Sample Code for java.time

Sample Code for Predicate

Sample Code for Consumer

Sample Code for MapMerge

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_{Like Discuss Correct / Improve java java8 technical lead technical architect Asked in 14 Companies expert frequent}

Frequently asked in face to face interviews.

Q6. Write a program to print fibonacci series.

Core Java

Ans. int count = 15;
int[] fibonacci = new int[count];
fibonacci[0] = 0;
fibonacci[1] = 1;
for(int x=2; x < count; x++){
fibonacci[x] = fibonacci[x-1] + fibonacci[x-2];
}

for(int x=0; x< count; x++){
System.out.print(fibonacci[x] + " ");
}

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_{Like Discuss Correct / Improve ebay fibonacci series Asked in 66 Companies basic frequent}

Q7. What is a class and object ?

or

How would you explain a fresher the concept of class and object in simple terms ?

Core Java

Ans. Class is a template using which objects are created in memory. It's kind of a mold using which objects with body / state are made.

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_{Like Discuss Correct / Improve class object class vs object Asked in 4 Companies basic frequent}

Q8. Difference between merge and update in hibernate

Hibernate

^{This question was recently asked at 'Nucleus Software'.This question is still unanswered. Can you please provide an answer.}

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_{Like Discuss Correct / Improve Asked in 1 Companies}

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