L&T Technology Services Java Developer Interview Questions, Process, and Tips

Q1. Kth stair problem
Ans. 
The Kth stair problem involves finding the number of ways to reach the Kth stair by taking 1 or 2 steps at a time.
• Use dynamic programming to solve this problem efficiently.

• The number of ways to reach the Kth stair is equal to the sum of ways to reach (K-1)th stair and (K-2)th stair.

• Base cases: For K=1, there is only 1 way. For K=2, there are 2 ways.

• Example: For K=4, there are 5 ways to reach the 4th stair - [1,1,1,1],
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Q2. Asteroid Collision
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Q1. Dbms questions On normalization , concurrency control and SQL queries
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Q2. Project related questions build and uploaded on my GitHub
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Q1. Explain architecture of your project
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Q2. Some questions on Java, Spring Boot and sql
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Q1. Project flow and some behavioural questions
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Q2. Project contribution of yours
Ans. 
Developed a web application for tracking employee attendance and performance
• Implemented user authentication and authorization using Spring Security

• Utilized Hibernate for database interaction and data persistence

• Designed and developed RESTful APIs for frontend integration

• Used AngularJS for frontend development to create interactive user interfaces
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Q1. Basic formalities before offer release
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A standard online test conducted through one of the testing platforms.

Q1. Java 8 features
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Q2. Rest API
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Q3. Java 8 coding problem
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Q4. Collections
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Q1. It was based on my previous project
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First round is quit easy

2 coding question based on dsa

Q1. Explain different phases of sdlc
Ans. 
SDLC stands for Software Development Life Cycle, which consists of different phases from planning to maintenance.
• 1. Planning phase involves defining project scope, requirements, and creating a project plan.

• 2. Analysis phase focuses on gathering and analyzing requirements to create a detailed system design.

• 3. Design phase involves creating a high-level design, detailed design, and architecture for the software.

• 4. Implem...read more
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Q2. 4 paillers of datastructure.
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The 4 pillars of data structure are arrays, linked lists, stacks, and queues.
• Arrays: Data structure that stores a collection of elements with a fixed size.

• Linked Lists: Data structure where each element points to the next element in the sequence.

• Stacks: Data structure that follows the Last In First Out (LIFO) principle.

• Queues: Data structure that follows the First In First Out (FIFO) principle.
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Q1. Chvvvv vvbbbbb isush shjshs jdudjdj
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Q2. Vvvhjjjc hhhjVv hsudjsj hsudjsh hdhdh
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Q1. Diff between abstract class and interface
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructor, fields, and methods, while interface cannot have any of these.

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

• Abstract classes are used to define a common behavior among subclasses, while interfaces are used to define a contract for classes...read more
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Q2. Explain about handler methods
Ans. 
Handler methods in Java are methods that are responsible for handling incoming requests and generating responses.
• Handler methods are typically defined in classes annotated with @Controller or @RestController.

• These methods are mapped to specific URLs using @RequestMapping or other mapping annotations.

• Handler methods can have parameters such as HttpServletRequest, HttpServletResponse, or model attributes.

• The return value...read more
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Q1. Explain how hashmap internally works
Ans. 
HashMap internally uses an array of linked lists to store key-value pairs.
• HashMap uses hashing to determine the index of the key in the array.

• If multiple keys hash to the same index, a linked list is used to store them.

• When retrieving a value, the key is hashed to find the index and then the linked list is searched for the key.
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Q2. Difference between vector and Arraylist
Ans. 
Vector is synchronized and slower, ArrayList is unsynchronized and faster.
• Vector is synchronized, ArrayList is not.

• Vector is slower due to synchronization, ArrayList is faster.

• Vector is legacy class, ArrayList is part of Java Collections framework.

• Vector doubles its size when full, ArrayList increases by 50%.
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