TCS Interview Questions, Process, and Tips

There were two categories logical and coding. Logical contained generally aptitude and reasoning questions. Coding consisted two questions one short and easy and the other a bit longer

Q1. Some OOPs concepts like inheritence and polymorphism
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Q2. Write a program to reverse a string
Ans. 
Program to reverse a string using array of characters
• Create a character array from the input string

• Use two pointers to swap characters from start and end of the array

• Continue swapping until the pointers meet in the middle
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Q3. Difference between String and StringBuffer
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String is immutable, StringBuffer is mutable in Java.
• String is immutable, meaning its value cannot be changed once it is created.

• StringBuffer is mutable, meaning its value can be changed after it is created.

• StringBuffer is synchronized, making it thread-safe for use in multi-threaded environments.

• StringBuffer is slower than String for most operations due to synchronization.

• Example: String str = "Hello"; StringBuffer sb
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Q4. Mutable and Immutable objects in java
Ans. 
Mutable objects can be changed after creation, while immutable objects cannot be changed.
• Mutable objects can have their state modified after creation, while immutable objects cannot.

• String and Integer objects are immutable in Java.

• Examples of mutable objects include ArrayList and StringBuilder.

• Immutable objects are thread-safe by default.

• Immutable objects are more secure as their state cannot be changed.
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Q1. What is java
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Java is a high-level, object-oriented programming language designed for portability and ease of use across platforms.
• Platform-independent: Java code can run on any device with a Java Virtual Machine (JVM). Example: Write once, run anywhere.

• Object-oriented: Supports concepts like inheritance, encapsulation, and polymorphism. Example: Class and object structures.

• Rich API: Provides a vast set of libraries for various task...read more
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Q2. Are you familiar with microservices?
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Microservices are an architectural style that structures an application as a collection of loosely coupled services.
• Microservices allow for independent deployment of services, enhancing agility.

• Each service can be developed in different programming languages; for example, a service in Java and another in Python.

• Microservices communicate over lightweight protocols, often using REST APIs or messaging queues.

• They promote ...read more
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Q1. Questions related about my resume
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Q2. Sql based questions
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Q1. MCQ, Analytical, logical
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Q1. Java related questions
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Q1. Experience and package
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