TCS iON Java Developer Interview Questions, Process, and Tips

Q1. What is a wrapper class in java
Ans. 
Wrapper classes in Java are classes that allow primitive data types to be accessed as objects.
• Wrapper classes provide a way to convert primitive data types into objects.

• They are used when an object is required, such as in collections or generics.

• Examples include Integer for int, Double for double, Boolean for boolean, etc.
Answered by AI
Add your answer
Q2. Encapsulation with an example?
Ans. 
Encapsulation is the concept of bundling data and methods that operate on the data into a single unit.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing external code from directly modifying it.

• Example: A class 'Car' with private variables like 'model', 'year', and public methods like 'getYear()' and 'setModel()'.
Answered by AI
Add your answer
Q3. What is the difference between hashmap and hashset
Ans. 
HashMap is a key-value pair collection while HashSet is a collection of unique elements.
• HashMap stores key-value pairs while HashSet stores unique elements.

• HashMap allows duplicate values but keys must be unique, while HashSet does not allow duplicates.

• HashMap uses keys to retrieve values, while HashSet does not have keys and values are the same.

• Example: HashMap map = new HashMap<>(); HashSet set = new
Answered by AI
Add your answer
Q4. What is the usage of optinal class
Ans. 
Optional class is used to handle null values in Java, preventing NullPointerExceptions.
• Optional class was introduced in Java 8 to provide a more elegant way of handling null values.

• It encourages developers to explicitly handle the presence or absence of a value, rather than relying on null checks.

• Optional class has methods like isPresent(), get(), orElse(), etc. to work with optional values.

• Using Optional class can mak...read more
Answered by AI
Add your answer

Q1. Just basic question tell me about yourself
Add your answer

Reasoning and quants

Coding test questions

Group discussion practice

Case study practice

Q1. Any type questions
Add your answer

Q1. Easy questions given
Add your answer

Q1. Opps concepts hibernate
Add your answer
Q2. Comparator comparable , spring boot
Add your answer

Mathematical and logical questions

Based on coding and programming

Q1. Oops concept in java
Ans. 
Oops concept in java
• Object-oriented programming paradigm

• Encapsulation, Inheritance, Polymorphism, Abstraction

• Classes and Objects

• Access Modifiers

• Interfaces and Abstract Classes
Answered by AI
Add your answer
Q2. Oops concept in c++ programming language
Ans. 
OOPs concepts in C++ include inheritance, polymorphism, encapsulation, and abstraction.
• Inheritance allows a class to inherit properties and methods from another class.

• Polymorphism allows objects to take on multiple forms.

• Encapsulation hides the implementation details of a class from other objects.

• Abstraction focuses on the essential features of an object and hides the unnecessary details.

• Example: A car class can inheri...read more
Answered by AI
Add your answer

Q1. What was your hobbies
Add your answer
Q2. Tell about yourself??
Add your answer
Q3. What role ur in interested in??
Add your answer

Q1. About your experience
Add your answer
Q2. About your biggest strength
Add your answer

Round duration - 60 minutes
Round difficulty - Easy

Technical Interview round with questions on Core Java concepts.

Q1. What are the primitive data types in Java?
Ans. 
Primitive data types in Java are basic data types that are not objects.
• Primitive data types include int, double, float, char, boolean, byte, short, and long.

• Examples: int num = 10; double price = 19.99; char letter = 'A'; boolean flag = true;
Answered by AI
View 1 more answer
Q2. What is the JVM?
Ans. 
JVM stands for Java Virtual Machine, it is an abstract computing machine that enables a computer to run Java programs.
• JVM is responsible for converting Java bytecode into machine code that can be executed by the computer's processor.

• It provides a platform-independent execution environment for Java programs.

• JVM manages memory, handles garbage collection, and provides security features for Java applications.

• Examples of J...read more
Answered by AI
View 1 more answer
Q3. Why is Java considered an object-oriented language?
Ans. 
Java is considered object-oriented because it supports the four main principles of OOP: encapsulation, inheritance, polymorphism, and abstraction.
• Java allows for the creation of classes and objects, which encapsulate data and behavior together.

• Inheritance is supported in Java, allowing classes to inherit attributes and methods from other classes.

• Polymorphism in Java allows objects to be treated as instances of their pa...read more
Answered by AI
Add your answer
Q4. What is JIT in Java?
Ans. 
JIT stands for Just-In-Time compiler in Java, which compiles Java bytecode into native machine code at runtime.
• JIT compiler improves the performance of Java applications by compiling bytecode into native machine code on-the-fly.

• It identifies and optimizes frequently executed code paths, resulting in faster execution.

• JIT compiler is a part of Java Virtual Machine (JVM) and helps in achieving high performance without the...read more
Answered by AI
Add your answer