TCS Interview Questions, Process, and Tips

Q1. Difference between public ,private and protected in java
Ans. 
In Java, public, private, and protected are access modifiers used to control the visibility of classes, methods, and variables.
• public: accessible from any other class

• private: accessible only within the same class

• protected: accessible within the same package and subclasses

• Example: public class MyClass {}

• Example: private int myVar;

• Example: protected void myMethod() {}
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Q2. Class based component and functional based component
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It was easy, Data Structure array

Basic js question and reactjs questions

Q1. Tell me about your self
Ans. 
I am a dedicated and experienced System Engineer with a strong background in network infrastructure and troubleshooting.
• Over 5 years of experience in designing, implementing, and maintaining complex systems

• Proficient in network protocols such as TCP/IP, DNS, DHCP

• Skilled in troubleshooting hardware and software issues

• Certified in Cisco CCNA and CompTIA Network+

• Strong communication and problem-solving skills
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Q1. What is the difference between INNER JOIN and OUTER JOIN?
Ans. 
INNER JOIN returns matching rows, while OUTER JOIN returns all rows with matches and NULLs for non-matching rows.
• INNER JOIN: Combines rows from two tables where there is a match in both tables.

• Example: SELECT * FROM A INNER JOIN B ON A.id = B.id; // Returns only matching rows.

• OUTER JOIN: Combines rows from two tables, returning all rows from one table and matching rows from the other.

• Types of OUTER JOIN: LEFT JOIN (all...read more
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Q2. What is a subquery? How is it different from a join?
Ans. 
A subquery is a query nested within another SQL query, while a join combines rows from two or more tables based on related columns.
• A subquery can return a single value or a set of values to be used in the main query.

• Example of a subquery: SELECT name FROM employees WHERE id IN (SELECT employee_id FROM sales);

• Joins combine rows from two or more tables based on a related column between them.

• Example of a join: SELECT empl...read more
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Q3. What are Python’s built-in decorators?
Ans. 
Python's built-in decorators are functions that modify the behavior of other functions or methods.
• 1. @staticmethod: Defines a method that does not operate on an instance of the class. Example: class MyClass: @staticmethod def my_method(): pass

• 2. @classmethod: Defines a method that operates on the class itself rather than an instance. Example: class MyClass: @classmethod de...read more
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Q1. Asking on technical
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Q2. Previous project
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Q1. Tell me about your project in previous organisation
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Q1. Tell me about your self
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Q2. Your last work experience
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Q1. Salary discussion
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Q2. Expected salary
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