Trianz Lead Java Developer Interview Questions and Answers

Q1. Explain Spring Boot
Add your answer
Q2. What is Redux in React
Add your answer
Q3. What is Context API in React
Add your answer

It was medium level java coding questions along with springboot, mcqs

Q1. ArrayList vs LinkedList
Ans. 
ArrayList is better for random access and LinkedList is better for frequent insertions and deletions.
• ArrayList uses dynamic array to store elements, allowing fast random access but slower insertions and deletions.

• LinkedList uses doubly linked list to store elements, allowing fast insertions and deletions but slower random access.

• Example: Use ArrayList when you need to frequently access elements by index. Use LinkedList...read more
Answered by AI
Add your answer
Q2. HashMap working
Ans. 
HashMap is a data structure in Java that stores key-value pairs and allows fast retrieval of values based on keys.
• HashMap is part of the Java Collections framework.

• It allows null keys and values.

• HashMap does not maintain insertion order.

• Example: HashMap map = new HashMap<>();
Answered by AI
Add your answer

Q1. Basic questions on Java concepts like OOPS, multi threading, stream. MySQL join queries
Add your answer
Q2. Questions on Spring Boot and REST API
Add your answer

Q1. Questions on currently working project?.
Add your answer
Q2. Your contribution to the project and what challenges you faced?
Add your answer

Q1. How annotation works?
Ans. 
Annotations in Java provide metadata about a program that can be used by the compiler or at runtime.
• Annotations start with the @ symbol.

• Annotations can be used to provide information to the compiler or to runtime environments.

• Annotations can be used to define custom metadata for classes, methods, fields, etc.

• Annotations can also be used for code generation, documentation, and validation.

• Examples of annotations in Java ...read more
Answered by AI
Add your answer
Q2. CondurentSkipListMap, how does it work
Ans. 
ConcurrentSkipListMap is a concurrent, sorted map implementation in Java.
• ConcurrentSkipListMap is a concurrent version of SkipListMap, which is a sorted map implementation based on skip list data structure.

• It allows multiple threads to access and modify the map concurrently.

• It provides logarithmic time complexity for most operations, making it efficient for concurrent access.

• Example: ConcurrentSkipListMap
Answered by AI
Add your answer

Q1. Tell me about yourself and the project you have done
Add your answer
Q2. Have you work on the spring boot freamwork
Add your answer
Q3. Collection framework
Add your answer
Q4. Write a program to make a Linkedlist, you have to develop the logic for the linkedlist suppose your are the first who is going to invent the linkedlist what would be the apporach how you create the add/del...read more
Add your answer
Q5. Have you worked on the Data Structures
Ans. 
Yes, I have worked on various data structures like arrays, linked lists, stacks, queues, trees, and graphs.
• I have implemented algorithms using data structures like sorting, searching, and traversal.

• I have optimized code by choosing the appropriate data structure for the problem.

• I have used data structures in projects to efficiently store and manipulate data.
Answered by AI
Add your answer
Q6. Have you worked on the Multithreading
Ans. 
Yes, I have experience working on Multithreading in Java.
• Implemented multithreading using Java's Thread class

• Used synchronized keyword to handle thread synchronization

• Utilized Executor framework for managing thread pools
Answered by AI
Add your answer
Q7. Write a program to find the min and max no from the array
Ans. 
Program to find min and max no from array of strings
• Iterate through the array and compare each element to find min and max

• Use Integer.parseInt() to convert strings to integers for comparison

• Initialize min and max variables with first element of array
Answered by AI
Add your answer
Q8. Difference between the @controller vs @restcontroller
Ans. 
The @Controller annotation is used to create a controller class in Spring MVC, while @RestController is used to create RESTful web services.
• The @Controller annotation is used to create a controller class in Spring MVC, which is used to handle traditional web requests.

• The @RestController annotation is used to create RESTful web services, which return data in JSON or XML format.

• The @RestController annotation is a special...read more
Answered by AI
Add your answer
Q9. Difference between the @service vs @Repository
Ans. 
The @Service annotation is used to mark a class as a service, while the @Repository annotation is used to mark a class as a repository.
• The @Service annotation is typically used on service layer classes, which contain business logic.

• The @Repository annotation is typically used on repository classes, which interact with a database or other data source.

• Both annotations are used for component scanning and dependency inject...read more
Answered by AI
Add your answer
Q10. Difference between the Arrylist vs Linkedlist
Ans. 
ArrayList is implemented using a dynamic array while LinkedList is implemented using a doubly linked list.
• ArrayList provides fast access to elements using index, but slow insertion and deletion.

• LinkedList provides fast insertion and deletion, but slow access to elements.

• Example: ArrayList is suitable for scenarios where random access is required, while LinkedList is suitable for scenarios where frequent insertion and d
Answered by AI
Add your answer

1 Assignment which you need to solve in front of the interviewer

Q1. Questions on Java Streams
Add your answer
Q2. Questions on springboot
Add your answer

Q1. Java 8 feature & java 9
Add your answer
Q2. Profiler concept internal work
Add your answer

Separate 0 and 1 and then store in the sme array

Q1. Micro service disadvantage
Ans. 
Microservices can introduce complexity, communication overhead, and potential performance issues.
• Increased complexity due to managing multiple services

• Communication overhead between services

• Potential performance issues due to network latency

• Difficulty in maintaining consistency across services
Answered by AI
Add your answer
Q2. @functionalinterface can we extend or not, map & flatmap
Ans. 
No, @FunctionalInterface cannot be extended. Map and flatMap are default methods in the interface and cannot be overridden.
• No, @FunctionalInterface cannot be extended as it is a single abstract method interface.

• Map and flatMap are default methods in the interface and cannot be overridden.

• Example: public interface MyInterface { void myMethod(); default void myDefaultMethod() { // implementation } }
Answered by AI
Add your answer