Planon Software Services Senior Java Developer Interview Questions and Answers

It was combination of mcqs and 2 coding questions

Q1. What is oops concepts
Ans. 
Object-oriented programming concepts that focus on objects and classes for better code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation det...read more
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Q2. Difference between java nd putjon
Ans. 
Java is a programming language while Putjon is not a recognized term in software development.
• Java is a widely used programming language for developing applications.

• Putjon is not a recognized term in software development, it may be a typo or a specific term not commonly used.

• There is no direct comparison between Java and Putjon as they are not related.
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Q3. Tell about ur project
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Q1. What are your strengths
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Q2. What is ur greatest comeback
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C,c++ questions and two coding questions. basic mcq

Q1. Treeset, hashset difference
Ans. 
TreeSet and HashSet are both implementations of the Set interface in Java, but they have some key differences.
• TreeSet is a sorted set that maintains elements in ascending order, while HashSet does not guarantee any specific order.

• TreeSet uses a Red-Black tree data structure for storage, which allows for efficient retrieval of elements in sorted order.

• HashSet uses a hash table for storage, which provides constant-time p...read more
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Q2. Oops concept, dbms, programming questions
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Q3. Set and treeset and hashset
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Q1. Design patterns, Collections
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Q2. Spring Boot, Annotations, controller class, hibernate
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Coding test was medium to hard leetcode problems.

Q1. Implement readers-writer lock
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Basics questions of logical reasoning , english , mathematics etc

Q1. How to check current version of java coding question reverse a string project explaniation that you mention in your resume. interfaces?
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Q2. Encapsulation vs abstraction
Ans. 
Encapsulation is hiding implementation details while abstraction is hiding unnecessary details.
• Encapsulation is achieved through access modifiers like private, protected, and public.

• Abstraction is achieved through abstract classes and interfaces.

• Encapsulation protects the data from external interference while abstraction focuses on the essential features.

• Example of encapsulation: hiding the implementation details of a ...read more
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Q3. Jvm vs jre vs jdk
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JVM is a virtual machine that executes Java bytecode. JRE is a runtime environment that includes JVM and libraries. JDK is a development kit that includes JRE and tools for developing Java applications.
• JVM stands for Java Virtual Machine and is responsible for executing Java bytecode.

• JRE stands for Java Runtime Environment and includes JVM and libraries required to run Java applications.

• JDK stands for Java Development ...read more
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Q1. I was asked about pascals triangle and basic questions from oops, dbms, SQL, networking and other topics.
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Q1. Linked list (detect loop, reverse, delte a node) tree (height, DFS) graph theory concept C++ basic questions
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Q1. Total 3 round of Technical interviews.
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