GAVS Technologies Junior Java Developer Interview Questions, Process, and Tips

Aptitude test like technical questions

Coding test for technical analysis

Q1. HR is asking same basic questions java
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Q1. Technical questions asked
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Q2. Full stack java developer
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Q1. Static related que sql query to fetch data starting with vowel method overriding exceptions
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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
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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<>();
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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
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Q2. CondurentSkipListMap, how does it work
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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
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Q1. Tell me about yourself and the project you have done
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Q2. Have you work on the spring boot freamwork
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Q3. Collection framework
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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
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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.
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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
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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
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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
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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
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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
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1 Assignment which you need to solve in front of the interviewer

Q1. Questions on Java Streams
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Q2. Questions on springboot
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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
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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 } }
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