VVDN Technologies Java Developer Interview Questions and Answers

Q1. Tell me about your project
Ans. 
Developed a web-based inventory management system for a retail company.
• Used Java, Spring Boot, and MySQL for backend development.

• Implemented user authentication and authorization using Spring Security.

• Designed a responsive front-end using HTML, CSS, and JavaScript.

• Integrated barcode scanning functionality for efficient inventory tracking.
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Q2. Class vs object
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A class is a blueprint or template for creating objects, while an object is an instance of a class.
• A class defines the properties and behaviors of objects, while an object is a specific instance of a class.

• Classes can be used to create multiple objects with similar characteristics.

• Objects have state (attributes) and behavior (methods) defined by the class.

• Example: Class 'Car' defines properties like 'color' and 'model'...read more
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Q1. Salary expectation
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Q2. Date to join?
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It was of 1 hour 30 mins.

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Q1. Tell me about yourself.
Ans. 
I am a Java Developer with 5 years of experience in developing web applications and software solutions.
• Experienced in Java programming language

• Proficient in developing web applications

• Skilled in software solution development
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Q2. What is class in java.
Ans. 
A class in Java is a blueprint for creating objects, defining attributes and behaviors.
• Classes are used to create objects in Java.

• They define attributes (fields) and behaviors (methods) of the objects.

• Classes can be instantiated to create multiple objects of the same type.

• Example: class Car { String color; void drive() { ... } }

• Example: Car myCar = new Car();
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Q1. Comparable vs Comparator
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Comparable is an interface used for natural ordering, while Comparator is used for custom ordering in Java.
• Comparable interface is used to define the natural ordering of objects. It is implemented by the class whose objects are to be sorted.

• Comparator interface is used to define custom ordering of objects. It is implemented by a separate class that compares objects based on specific criteria.

• Example: Sorting a list of ...read more
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Q2. Difference between List and Set

Ans. 

List allows duplicate elements and maintains insertion order, while Set does not allow duplicates and does not maintain order.

• List can contain duplicate elements, Set cannot

• List maintains insertion order, Set does not guarantee order

• List is implemented by classes like ArrayList, LinkedList, Set is implemented by classes like HashSet, TreeSet

• Example: List list = new ArrayList<>(); Set set = new HashSet<>();

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