TCS Interview Questions and Answers

Overriding the equals method allows for custom comparison logic in Java classes.

• Override the equals method in a class to provide custom comparison logic.

• Ensure the overridden equals method follows the contract specified in the Java documentation.

• Consider overriding the hashCode method as well when overriding equals to maintain consistency.

Program to reverse a string using array of characters

• Create an array of characters to store the input string

• Iterate through the input string and store each character in the array

• Iterate through the array in reverse order to construct the reversed string

PUT is used to update or replace an existing resource, while POST is used to create a new resource.

• PUT is idempotent, meaning multiple identical requests will have the same effect as a single request.

• POST is not idempotent, meaning multiple identical requests may have different effects.

• PUT is used when the client knows the specific URI of the resource it wants to update.

• POST is used when the server assigns a URI for the newly created resource.

REST APIs typically use HTTP methods like GET, POST, PUT, DELETE to perform CRUD operations on resources.

• GET - retrieve data from a server

• POST - create new data on a server

• PUT - update existing data on a server

• DELETE - remove data from a server

Test case design techniques are methods used to create test cases for software testing.

• Boundary Value Analysis

• Equivalence Partitioning

• Decision Table Testing

• State Transition Testing

• Use Case Testing

Root cause analysis techniques are used to identify the underlying cause of a problem or issue.

• Fishbone diagram (Ishikawa diagram)

• 5 Whys technique

• Pareto analysis

• Fault tree analysis

• Failure mode and effects analysis (FMEA)