TestingXperts Java Developer Interview Questions and Answers

Q1. What is class what is object what is different between private protected and public and default
Ans. 
A class is a blueprint for creating objects, while an object is an instance of a class. Private, protected, public, and default are access modifiers in object-oriented programming.
• A class is a template or blueprint that defines the properties and behaviors of objects.

• An object is an instance of a class, created using the class blueprint.

• Private access modifier restricts access to class members within the same class.

• Pro...read more
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Q2. What is object ?
Ans. 
An object is a self-contained entity that consists of both data and behavior.
• Objects are instances of classes in object-oriented programming.

• They encapsulate data and provide methods to manipulate that data.

• Objects can interact with each other through method calls and message passing.

• Examples of objects include a car, a person, or a bank account.
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Q3. What is public?
Ans. 
Public is a keyword in programming languages that denotes the accessibility of a class, method, or variable.
• Public is one of the access modifiers in object-oriented programming.

• It allows the class, method, or variable to be accessed from any other class or package.

• Public members are part of the public API of a software component.

• Example: public class MyClass { ... }

• Example: public void myMethod() { ... }

• Example: public
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Q4. What is private?
Ans. 
In programming, private is an access modifier that restricts the visibility of a class member to within its own class.
• Private is used to encapsulate data and prevent direct access from outside the class.

• Private members can only be accessed through public methods or properties.

• Private variables are often used to store internal state or implementation details.

• Private methods are used for internal logic and are not meant
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Q5. What is protected
Ans. 
protected is an access modifier in object-oriented programming that restricts access to members within the same package or subclasses.
• protected is one of the four access modifiers in Java, along with public, private, and default.

• Members declared as protected can be accessed within the same package or by subclasses.

• Protected members are not accessible outside the package unless accessed through inheritance.

• Example: prot...read more
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That was conducted in my College and it was online assessment for aptitude

Q1. Difference between == and ===
Ans. 
The == operator checks for equality, while the === operator checks for strict equality (including data type).
• The == operator only checks for equality of values, not data types.

• The === operator checks for both equality of values and data types.

• Example: 5 == '5' would return true, but 5 === '5' would return false.
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Q1. Describe your final year project
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Q2. What was your role in your final year project
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Q1. Salary expectation
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Oop concept, Multithread, String

Q1. Tell us about your experience.
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Q2. In english, give me a feedback you received lately.
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Q1. Brief explanation of SOLID principles
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Q2. Ref vs out arguments
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3 Questions of mid difficulty

2 questions of mid to hard difficulty

Q1. Basic DSA and problem solving related questions
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Q2. How to design and implement a dictionary application
Ans. 
Design and implement a dictionary application for easy word lookup
• Define data structure to store words and their meanings

• Implement search functionality to look up words quickly

• Include features like word suggestions, synonyms, and antonyms

• Allow users to add new words and meanings to the dictionary

• Consider implementing a user-friendly interface for easy navigation
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There was online aptitude test

There was pattern design coding

Q1. Tell me about yourself ?
Ans. 
I am a software developer with experience in web development and a passion for problem-solving.
• Experienced in web development using HTML, CSS, and JavaScript

• Proficient in programming languages such as Java and Python

• Familiar with frameworks like React and Angular

• Strong problem-solving and analytical skills

• Ability to work well in a team and communicate effectively
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Q1. Number is odd or not
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