Virtusa Consulting Services Senior Software Engineer Interview Questions and Answers

adb devices command is used to list all Android devices connected to a computer via USB debugging

• Used to check the list of Android devices connected to the computer for debugging purposes

• Helps in identifying the device ID and status (offline, online, unauthorized)

• Commonly used in Android development for testing and debugging

• Example: 'adb devices' command will display a list of connected devices with their respective status

We added dependencies like Appium, TestNG, Selenium, and Apache POI in POM.xml for mobile automation.

• Appium dependency for mobile automation testing

• TestNG dependency for test execution and reporting

• Selenium dependency for web automation

• Apache POI dependency for reading and writing Excel files

Remove duplicates and count frequencies of characters in an array of strings.

• Iterate through each string in the array

• Use a hashmap to store characters and their frequencies

• Remove duplicates by checking if character already exists in hashmap

Decorators in Python are functions that modify the behavior of other functions or methods. __name__ == __main__ is used to check if a Python script is being run directly or imported as a module.

• Decorators are used to add functionality to existing functions without modifying their code.

• They are defined using the @decorator syntax before the function definition.

• Example: @staticmethod decorator in Python is used to define a method that doesn't access or modify class or instance ...read more

An index is a data structure that improves the speed of data retrieval operations on a database table.

• Indexes are used to quickly locate data without having to search every row in a database table.

• They are created on columns in a database table to speed up data retrieval operations.

• Examples include primary keys, unique keys, and non-unique keys.

Delete and truncate are SQL commands used to remove data from a table, but they differ in their functionality.

• DELETE is a DML command used to remove specific rows from a table based on a condition

• TRUNCATE is a DDL command used to remove all rows from a table, resetting auto-increment values

• DELETE can be rolled back, while TRUNCATE cannot be rolled back

• DELETE triggers delete triggers, while TRUNCATE does not trigger any triggers

• DELETE is slower than TRUNCATE as it logs individ...read more

Null is a value that represents the absence of a value or a placeholder.

• Null is often used in programming to indicate that a variable does not have a value assigned to it.

• It is different from an empty string or zero, as it specifically means 'no value'.

• For example, a database field may have a null value if no data has been entered for that field.