Cornerstone OnDemand Java Developer Intern Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Medium

The interviewer was really cool. He realized that I mostly work on java applications so he chose to ask me stuff related to that. He didn't want me to know the answer well but just wanted me to approach to it, maybe think more. He went through my resume back and forth and asked mostly about all my projects and their logic and how could I take them to the next level.
Tips: Be confident. Its okay not to know any answer, just try giving it a shot in the approach.

Q1. What is the difference between an abstract class and an interface in Java?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, member variables, and methods with implementation.

• Interface can only have abstract methods and constants.

• A class can implement multiple interfaces but can only extend one abstract class.

• Example: Abstract class - Animal with abstract method 'eat', Interface - Flyable with m
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Q2. What is the difference between 'final', 'finally', and 'finalize' in Java?
Ans. 
final is a keyword used to declare constants, finally is a block used in exception handling, and finalize is a method used for cleanup.
• final is a keyword used to declare constants in Java, meaning the value cannot be changed once assigned. Example: final int x = 10;

• finally is a block used in exception handling to ensure a piece of code is always executed, whether an exception is thrown or not. Example: try { // code } ...read more
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Q3. What is the difference between the private and final access modifiers in Java?
Ans. 
Private restricts access to the class itself, while final prevents inheritance and method overriding.
• Private access modifier restricts access to the class itself, while final access modifier prevents inheritance and method overriding.

• Private members are only accessible within the same class, while final classes cannot be extended and final methods cannot be overridden.

• Example: private int num; - num can only be accesse...read more
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Q4. What are the steps for establishing a JDBC connection?
Ans. 
Establishing a JDBC connection involves loading the driver, creating a connection, creating a statement, executing queries, and handling exceptions.
• Load the JDBC driver using Class.forName() method

• Create a connection using DriverManager.getConnection() method

• Create a statement using connection.createStatement() method

• Execute queries using statement.executeQuery() method

• Handle exceptions using try-catch blocks
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Q5. What is JSON?
Ans. 
JSON is a lightweight data interchange format used to store and transmit data between a server and a web application.
• JSON stands for JavaScript Object Notation.

• It is easy for humans to read and write, and easy for machines to parse and generate.

• JSON is language-independent and can be used with any programming language.

• Example: {"name": "John", "age": 30}

• Example: [{"name": "Alice", "age": 25}, {"name": "Bob", "age": 35}
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Q6. What do you know about garbage collection in Java?
Ans. 
Garbage collection in Java is the process of automatically managing memory by deallocating objects that are no longer needed.
• Garbage collection helps in preventing memory leaks by reclaiming memory used by objects that are no longer referenced.

• Java uses a garbage collector to automatically manage memory, unlike languages like C++ where memory management is manual.

• Garbage collection in Java can be triggered by calling S...read more
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Round duration - 30 minutes
Round difficulty - Easy

I wouldn't say it went great but it was fine. I did not think I would clear it as for most of the questions the interviewer seemed disappointed and wanted more out of me.

Round duration - 90 minutes
Round difficulty - Medium

It was Technical + Aptitude MCQ round.The technical section consisted if MCQ related to DSA,OS,DBMS.The aptitude section consisted of questions related to basic mathematics.

Q1. 
Candies Distribution Problem Statement
Prateek is a kindergarten teacher with a mission to distribute candies to students based on their performance. Each student must get at least one candy, and if two s...read more
Ans. 
The task is to distribute candies to students based on their performance while minimizing the total candies distributed.
• Create an array to store the minimum candies required for each student.

• Iterate through the students' ratings array to determine the minimum candies needed based on the given criteria.

• Consider the ratings of adjacent students to decide the number of candies to distribute.

• Calculate the total candies req...read more
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Round duration - 30 minutes
Round difficulty - Medium

It was a technical interview testing the basic skills of OS and DBMS of candidates along with few project discussions from your CV.

Q1. Can you write 15 Linux commands along with their functions?
Ans. 
List of 15 Linux commands with their functions
• ls - list directory contents

• pwd - print working directory

• cd - change directory

• mkdir - make a new directory

• rm - remove files or directories

• cp - copy files and directories

• mv - move or rename files and directories

• grep - search for patterns in files

• chmod - change file permissions

• ps - display information about running processes

• top - display and update sorted information about pr...read more
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Q2. What are DDL (Data Definition Language) and DML (Data Manipulation Language)?
Ans. 
DDL is used to define the structure of database objects, while DML is used to manipulate data within those objects.
• DDL includes commands like CREATE, ALTER, DROP to define database objects like tables, indexes, etc.

• DML includes commands like INSERT, UPDATE, DELETE to manipulate data within tables.

• Example of DDL: CREATE TABLE employees (id INT, name VARCHAR(50));

• Example of DML: INSERT INTO employees VALUES (1, 'John Doe
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