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Intellect Design Arena Java Developer Interview Questions and Answers
18 Interview questions
To find the 3rd highest salary, use SQL queries with subqueries or the DISTINCT keyword.
Use the DISTINCT keyword to eliminate duplicates: SELECT DISTINCT salary FROM employees ORDER BY salary DESC LIMIT 2, 1;
Alternatively, use a subquery: SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees));
Another approach is using ROW_NUMBER...
Store file data in a database using Java by reading the file, converting it to a suitable format, and executing an SQL insert.
Read the file using FileInputStream or BufferedReader.
Convert the file data to a byte array for binary files or String for text files.
Use JDBC to connect to the database.
Prepare an SQL statement to insert the data into the appropriate table.
Execute the statement and handle exceptions.
JDBC (Java Database Connectivity) is an API that enables Java applications to interact with databases using SQL.
JDBC provides a standard interface for connecting to databases.
It consists of two main packages: java.sql and javax.sql.
JDBC drivers are required to connect to different databases (e.g., MySQL, Oracle).
Example of establishing a connection: DriverManager.getConnection(url, user, password).
JDBC supports ex...
HashSet is an unordered collection of unique elements, while Hashtable is a synchronized collection of key/value pairs.
HashSet does not allow duplicate elements, while Hashtable does not allow duplicate keys.
HashSet does not maintain insertion order, while Hashtable does not guarantee any order.
HashSet allows null values, while Hashtable does not allow null keys or values.
Java program to find duplicates in an array of strings
Create a HashSet to store unique elements
Iterate through the array and check if element is already in the HashSet
If element is already in the HashSet, it is a duplicate
Collection is an interface in Java that represents a group of objects, while Collections is a utility class that contains static methods for operating on collections.
Collection is an interface in Java that represents a group of objects.
Collections is a utility class in Java that contains static methods for operating on collections.
Example: List<String> list = new ArrayList<>(); Collection<String>...
Optimizing performance involves identifying bottlenecks and implementing efficient solutions.
Identify and address any inefficient algorithms or data structures
Optimize database queries and indexing
Implement caching mechanisms to reduce redundant computations
Use profiling tools to identify performance bottlenecks
Consider parallel processing or asynchronous operations for resource-intensive tasks
To give security to our application, we can implement various measures such as encryption, authentication, authorization, input validation, and regular security audits.
Implement encryption to protect sensitive data, such as using SSL/TLS for secure communication.
Use authentication mechanisms like OAuth, JWT, or multi-factor authentication to verify the identity of users.
Implement authorization to control access to...
Create and sort an array of strings in descending order
Create an array of strings
Use Arrays.sort() method with Collections.reverseOrder() comparator to sort in descending order
Create an array of strings and add the array
Declare an array of strings
Initialize the array with values
Use a loop to add the values to the array
Intellect Design Arena Java Developer Interview Experiences
14 interviews found
Anonymous
I applied via Recruitment Consulltant and was interviewed in Sep 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Difference between hashset and hashtable
- Q2. Collection vs Collections
(2 Questions)
- Q1. SQL query related questions
- Q2. Write a Java program to find the duplicate in Array
Skills evaluated in this interview
I applied via Naukri.com and was interviewed in Jun 2024. There was 1 interview round.
(5 Questions)
- Q1. Comparable and comparator
- Q2. Instance and local variable
- Q3. Abstract and interface
- Q4. Constructor and Methods
- Q5. Http methods like post,get,put,delete
Interview Preparation Tips
- Core java
- Spring
- Postman
I applied via Naukri.com and was interviewed in Apr 2024. There was 1 interview round.
(2 Questions)
- Q1. How to optimize the performance if an application
- Ans.
Optimizing performance involves identifying bottlenecks and implementing efficient solutions.
Identify and address any inefficient algorithms or data structures
Optimize database queries and indexing
Implement caching mechanisms to reduce redundant computations
Use profiling tools to identify performance bottlenecks
Consider parallel processing or asynchronous operations for resource-intensive tasks
- Q2. How to give security to our application
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Campus Placement and was interviewed in Nov 2023. There were 4 interview rounds.
Basic CS aptitude question
2 questions from Java and 2 questions from SQL, Easy to Medium Level
They let us choose our topic , We have to speak on that topic for few minutes , they will be checking the english fluency and presentation
(3 Questions)
- Q1. Technical Round I got lucky; they asked me basic java questions and Basic SQL theory
- Q2. Create an array and sort them in descending order
- Q3. Create an array and add the array
Interview Preparation Tips
Skills evaluated in this interview
Rahul Bake
I applied via Naukri.com and was interviewed in Apr 2024. There were 2 interview rounds.
Occurance of every elements in string
(1 Question)
- Q1. All basic question core java
HARSH GUPTA 20BCE1310
Pretty Straight forward, topic : "Is corporate work a new form of slavery?"
(1 Question)
- Q1. String Core Java questions, OOPs, JDBC and java related project work
Interview Preparation Tips
Sujata Bangar
Selected
I applied via Campus Placement and was interviewed before Nov 2023. There were 3 interview rounds.
English and reasoning
(5 Questions)
- Q1. Core Java questions
- Q2. SQL query and project details which we did
- Q3. What jdbc how it's work
- Ans.
JDBC (Java Database Connectivity) is an API that enables Java applications to interact with databases using SQL.
JDBC provides a standard interface for connecting to databases.
It consists of two main packages: java.sql and javax.sql.
JDBC drivers are required to connect to different databases (e.g., MySQL, Oracle).
Example of establishing a connection: DriverManager.getConnection(url, user, password).
JDBC supports executi...
- Q4. How to store file data to DB
- Ans.
Store file data in a database using Java by reading the file, converting it to a suitable format, and executing an SQL insert.
Read the file using FileInputStream or BufferedReader.
Convert the file data to a byte array for binary files or String for text files.
Use JDBC to connect to the database.
Prepare an SQL statement to insert the data into the appropriate table.
Execute the statement and handle exceptions.
- Q5. Sql query for 3rd highest salary of employee
Economic growth vs environment impact
Interview Preparation Tips
- Core Java
- Java8
- Stream api
- Data Structures
- SQL query
- Project
I applied via Naukri.com and was interviewed in Jul 2022. There were 2 interview rounds.
(2 Questions)
- Q1. What is the difference between collection and collections in core java
- Q2. What is Constructor in core Java
Interview Preparation Tips
Skills evaluated in this interview
Selected
I applied via Naukri.com and was interviewed before Feb 2023. There were 3 interview rounds.
MCQ based on core Java and collection
(2 Questions)
- Q1. Technical round based on core Java , collection, map functionality, encapsulation,
- Q2. Write code on live example based on method overloading concept
(1 Question)
- Q1. Job Role and salary discussion
(1 Question)
- Q1. As per project requirements
(1 Question)
- Q1. Project discussion and salary discussion
Interview Preparation Tips
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