Tech Mahindra Senior Software Engineer Interview Questions, Process, and Tips

Static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.

• Static variables are shared among all instances of a class

• Static methods can be called without creating an object of the class

• Static keyword can be used to create static blocks for initializing static variables

• Static keyword can also be used to create static nested classes

Program in Java to count occurrence of each character in a string

• Create a HashMap to store characters and their counts

• Iterate through the string and update the counts in the HashMap

• Print the characters and their counts from the HashMap

Program to read and write data from Excel using a library like Apache POI or Openpyxl.

• Use a library like Apache POI for Java or Openpyxl for Python to interact with Excel files.

• Read data from Excel file using library functions and write data back to Excel file after processing.

• Handle exceptions like file not found or incorrect format when reading or writing to Excel.

Testcases for Whatsapp video calling feature

• Test if video call can be initiated successfully

• Test if video call can be accepted/rejected by recipient

• Test if video call quality is good

• Test if video call can be ended properly

• Test if video call can be switched to voice call

• Test if video call works on different network connections (3G, 4G, Wi-Fi)

• Test if video call works on different devices (Android, iOS)

• Test if video call