Pranion Technology Ventures Java Developer Interview Questions and Answers

String , Array ,Collection framework related questions.

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Q1. Html,Css,Js. Interviewer don't have knowledge on Java,React js.And if you don't able to answer basic html,css related questions they will disqualify you.
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Q1. Docker Basics:What is Docker, and how does it differ from traditional virtualization?Explain the purpose of Docker images and containers.Node.js Fundamentals:Describe the event-driven architecture of Node....read more
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Q1. Expected salary, family, future plans
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Q1. What is the diffrence between == and .equals() in java?
Ans. 
In Java, == compares memory addresses while .equals() compares the actual values of objects.
• == compares memory addresses of objects

• .equals() compares the actual values of objects

• Use == for comparing primitive data types

• Use .equals() for comparing objects like Strings
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Q2. == : Compares refrences (memory addresses) of objects. .equals() : Compares to content (value) of objects.
Ans. 
The '==' operator compares memory addresses of objects, while the .equals() method compares the content or value of objects.
• Use '==' for comparing memory addresses of objects.

• Use .equals() for comparing the content or value of objects.

• Example: String str1 = new String("hello"); String str2 = new String("hello"); str1 == str2 will return false, but str1.equals(str2) will return true.
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Q1. Write a short java program to check if a number is prime.
Ans. 
Java program to check if a number is prime
• Create a function that takes an integer as input

• Check if the number is less than 2, return false

• Iterate from 2 to the square root of the number, check for divisibility

• If the number is divisible by any number, return false

• Otherwise, return true
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Q2. A prime number is a number greater than 1.....etc
Ans. 
A prime number is a number greater than 1 that can only be divided by 1 and itself.
• Prime numbers are integers greater than 1

• They have only two factors: 1 and the number itself

• Examples of prime numbers: 2, 3, 5, 7, 11, 13
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Q1. What is the difference between abstract class and an interface in Java?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, member variables, and methods, while interface cannot.

• A class can implement multiple interfaces but can only extend one abstract class.

• Abstract classes are used to define a common behavior among subclasses, while interfaces are used to define a contract for classes to impl...read more
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Q2. An abstract class can have method implements and abstract method, while an interface only contains abstract method (before Java 8) . Abstract classes support single inheritance, whereas interfaces support ...read more
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Abstract classes can have both implemented and abstract methods, while interfaces can only have abstract methods. Abstract classes support single inheritance, interfaces support multiple inheritance.
• Abstract classes can have both implemented and abstract methods, providing more flexibility in design.

• Interfaces can only have abstract methods, promoting a more strict contract for implementing classes.

• Abstract classes sup...read more
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