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Infosys Fullstack Java Developer Interview Questions and Answers
9 Interview questions
Collection framework is a set of classes and interfaces that provide a way to store and manipulate groups of objects.
It provides interfaces like List, Set, Queue, etc. for storing collections of objects.
It also provides classes like ArrayList, HashSet, PriorityQueue, etc. that implement these interfaces.
It allows easy manipulation of collections using methods like add, remove, contains, etc.
It provides algorithms ...
ArrayList is not synchronized while Vector is synchronized.
ArrayList is faster than Vector as it is not synchronized.
Vector is thread-safe while ArrayList is not.
Vector is a legacy class while ArrayList is not.
Vector can grow by a specified amount while ArrayList grows by 50% of its size.
Example: ArrayList<Integer> list = new ArrayList<>(); Vector<Integer> vector = new Vector<>();
Example: l...
Joins in SQL are used to combine data from two or more tables based on a related column.
Joins are used to retrieve data from multiple tables in a single query.
There are different types of joins such as inner join, left join, right join, and full outer join.
Inner join returns only the matching rows from both tables, left join returns all rows from the left table and matching rows from the right table, right join re...
An interface in Java is a collection of abstract methods and constants that can be implemented by a class.
Interfaces are used to achieve abstraction and provide a way to implement multiple inheritance in Java.
All methods in an interface are abstract by default and cannot have a body.
A class can implement multiple interfaces but can only extend one class.
Interfaces can also have default and static methods with a bo...
Where clause filters rows before grouping, having clause filters groups after grouping.
Where clause is used to filter rows based on a condition before grouping.
Having clause is used to filter groups based on a condition after grouping.
Where clause is used with SELECT, UPDATE, DELETE statements.
Having clause is used with SELECT statement and GROUP BY clause.
Where clause cannot contain aggregate functions.
Having cla...
Synchronization is the process of coordinating multiple threads to ensure safe and consistent access to shared resources.
Synchronization is used to prevent race conditions and ensure thread safety.
It can be achieved using synchronized blocks or methods.
Synchronization can cause performance issues if not used properly.
Example: Synchronizing access to a shared counter variable in a multi-threaded application.
Encapsulation is the process of hiding implementation details and providing access to only necessary information.
Encapsulation is achieved through access modifiers such as public, private, and protected.
It helps in achieving data abstraction and information hiding.
Encapsulation provides better control over the data and prevents unauthorized access.
Example: A class with private variables and public methods to acces...
Autoboxing is the automatic conversion of primitive data types to their corresponding object wrapper classes.
Autoboxing allows primitive data types to be used as objects.
Auto-unboxing is the reverse process of autoboxing.
Autoboxing and auto-unboxing are performed automatically by the compiler.
Example: int i = 10; Integer j = i; // autoboxing
Example: Integer j = 10; int i = j; // auto-unboxing
Legacy classes in Java are the classes that have been replaced by newer versions but are still supported for backward compatibility.
Legacy classes are part of the Java API and are still supported for backward compatibility.
They have been replaced by newer versions but are still used in older applications.
Examples of legacy classes include Vector, Hashtable, and Enumeration.
Legacy classes are not recommended for us...
Infosys Fullstack Java Developer Interview Experiences
1 interview found
(9 Questions)
- Q1. What is sychronization ?
- Ans.
Synchronization is the process of coordinating multiple threads to ensure safe and consistent access to shared resources.
Synchronization is used to prevent race conditions and ensure thread safety.
It can be achieved using synchronized blocks or methods.
Synchronization can cause performance issues if not used properly.
Example: Synchronizing access to a shared counter variable in a multi-threaded application.
- Q2. What is encapsulation ?
- Ans.
Encapsulation is the process of hiding implementation details and providing access to only necessary information.
Encapsulation is achieved through access modifiers such as public, private, and protected.
It helps in achieving data abstraction and information hiding.
Encapsulation provides better control over the data and prevents unauthorized access.
Example: A class with private variables and public methods to access the...
- Q3. What is interface in java ?
- Ans.
An interface in Java is a collection of abstract methods and constants that can be implemented by a class.
Interfaces are used to achieve abstraction and provide a way to implement multiple inheritance in Java.
All methods in an interface are abstract by default and cannot have a body.
A class can implement multiple interfaces but can only extend one class.
Interfaces can also have default and static methods with a body.
Ex...
- Q4. What is collection framework?
- Ans.
Collection framework is a set of classes and interfaces that provide a way to store and manipulate groups of objects.
It provides interfaces like List, Set, Queue, etc. for storing collections of objects.
It also provides classes like ArrayList, HashSet, PriorityQueue, etc. that implement these interfaces.
It allows easy manipulation of collections using methods like add, remove, contains, etc.
It provides algorithms like ...
- Q5. What is diffrence between Arraylist and vector ?
- Ans.
ArrayList is not synchronized while Vector is synchronized.
ArrayList is faster than Vector as it is not synchronized.
Vector is thread-safe while ArrayList is not.
Vector is a legacy class while ArrayList is not.
Vector can grow by a specified amount while ArrayList grows by 50% of its size.
Example: ArrayList<Integer> list = new ArrayList<>(); Vector<Integer> vector = new Vector<>();
Example: list.a...
- Q6. What are the legacy classes in java?
- Ans.
Legacy classes in Java are the classes that have been replaced by newer versions but are still supported for backward compatibility.
Legacy classes are part of the Java API and are still supported for backward compatibility.
They have been replaced by newer versions but are still used in older applications.
Examples of legacy classes include Vector, Hashtable, and Enumeration.
Legacy classes are not recommended for use in ...
- Q7. What is joins in SQL ?
- Ans.
Joins in SQL are used to combine data from two or more tables based on a related column.
Joins are used to retrieve data from multiple tables in a single query.
There are different types of joins such as inner join, left join, right join, and full outer join.
Inner join returns only the matching rows from both tables, left join returns all rows from the left table and matching rows from the right table, right join returns...
- Q8. What is autoboxing and auto-unboxing ?
- Ans.
Autoboxing is the automatic conversion of primitive data types to their corresponding object wrapper classes.
Autoboxing allows primitive data types to be used as objects.
Auto-unboxing is the reverse process of autoboxing.
Autoboxing and auto-unboxing are performed automatically by the compiler.
Example: int i = 10; Integer j = i; // autoboxing
Example: Integer j = 10; int i = j; // auto-unboxing
- Q9. Difference between where clause and having clause in SQL ?
- Ans.
Where clause filters rows before grouping, having clause filters groups after grouping.
Where clause is used to filter rows based on a condition before grouping.
Having clause is used to filter groups based on a condition after grouping.
Where clause is used with SELECT, UPDATE, DELETE statements.
Having clause is used with SELECT statement and GROUP BY clause.
Where clause cannot contain aggregate functions.
Having clause c...
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- Q1. What are your salary expectations?
- Ans.
I am open to discussing salary based on the responsibilities and requirements of the position.
I am flexible and open to negotiation.
I am looking for a competitive salary based on my skills and experience.
I would like to be compensated fairly for the value I can bring to the company.
I am interested in discussing the overall compensation package, including benefits and bonuses.
- Q2. What is your family background?
- Ans.
My family background is diverse and multicultural, with members from different countries and professions.
My parents are from different countries, which has exposed me to different cultures and languages.
My father is a doctor and my mother is an engineer, which has influenced my interest in both medicine and technology.
I have relatives who are teachers, artists, and entrepreneurs, which has broadened my perspective on v...
- Q3. Why are you looking for a change?
- Ans.
Looking for new challenges and growth opportunities.
Seeking a more challenging role to enhance my skills and knowledge.
Interested in working with new technologies and frameworks.
Want to be part of a dynamic and innovative team.
Desire for career growth and advancement.
Looking for a better work-life balance.
- Q4. Where do you see yourself in 5 years?
- Ans.
In 5 years, I see myself as a highly skilled Fullstack Java Developer, leading a team and working on complex projects.
Leading a team of developers
Working on complex projects
Continuously improving my skills
Contributing to the success of the company
- Q5. Tell me about yourself.
- Ans.
I am a Fullstack Java Developer with experience in developing web applications using Java, Spring, and JavaScript.
I have a strong understanding of Java programming language and its frameworks like Spring and Hibernate.
I am proficient in front-end technologies like HTML, CSS, and JavaScript.
I have experience in developing RESTful APIs and working with databases like MySQL and MongoDB.
I am familiar with Agile development...
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Anonymous
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- Q1. Java Basic questions
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- Q3. Simple DSA problem: "introduction" find duplicate characters
- Ans.
Find duplicate characters in a given array of strings
Iterate through each string in the array
For each string, iterate through each character and store the count in a hashmap
If the count of any character is greater than 1, it is a duplicate
- Q4. Write code for REST API using spring boot, include all annotation
- Ans.
Code for REST API using Spring Boot with annotations
Use @RestController annotation to define the class as a REST controller
Use @RequestMapping annotation to map HTTP requests to handler methods
Use @GetMapping, @PostMapping, @PutMapping, @DeleteMapping annotations for specific HTTP methods
Use @PathVariable annotation to extract values from the URI
Use @RequestBody annotation to bind HTTP request body to a method paramete...
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