Daffodil Software Junior Java Developer Interview Questions and Answers

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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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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Simple logical based

Palindrome
Reverse a string

Q1. Oops pillar define and explain
Ans. 
The four pillars of Object-Oriented Programming (OOP) are Abstraction, Encapsulation, Inheritance, and Polymorphism.
• Abstraction: Hides complex implementation details and only shows the necessary features to the outside world.

• Encapsulation: Bundles data and methods that operate on the data into a single unit, preventing direct access to data from outside the class.

• Inheritance: Allows a new class to inherit properties an...read more
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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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This test was conducted in MSG browser and it has around 30 questions and around 3 to 5 are related to coding

Our topic of discussion is future of jobs and take the first initiative and don't go off topic and try to agree and add points with the fellow members

Q1. Tell me about yourself
Ans. 
Experienced Java Developer with a passion for creating efficient and scalable solutions.
• Over 5 years of experience in Java development

• Strong knowledge of object-oriented programming principles

• Proficient in Spring framework and Hibernate

• Experience with RESTful web services and microservices architecture

• Familiar with Agile development methodologies
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Q2. Tell me about the project
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Q3. Do you known nodejs
Ans. 
Yes, Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine.
• Node.js is used for server-side scripting and building scalable network applications.

• It allows developers to use JavaScript for both client-side and server-side development.

• Node.js has a large ecosystem of open-source libraries and frameworks like Express.js.

• It is commonly used for building real-time web applications, APIs, and microservices.
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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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Q1. == operation & .equals() method method overloading
Ans. 
The == operator is used to compare references in Java, while the .equals() method is used to compare values. Method overloading is when multiple methods have the same name but different parameters.
• Use == to compare references, use .equals() to compare values

• Method overloading allows multiple methods with the same name but different parameters

• Example: String str1 = new String("hello"); String str2 = new String("hello");...read more
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Q2. Linked list working with example
Ans. 
A linked list is a data structure where each element points to the next element in the list.
• Linked list is made up of nodes, each containing data and a reference to the next node.

• Insertion and deletion are efficient in linked lists compared to arrays.

• Example: Node 1 -> Node 2 -> Node 3 -> null
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