SenseHR Interview Questions and Answers

Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.

• Inheritance allows for code reusability and promotes a hierarchical relationship between classes.

• There are different types of inheritance such as single inheritance, multiple inheritance, multilevel inheritance, and hierarchical inheritance.

• Example: Class B inheriting from Class A - 'class B extends A'

• Example: Class C inheriting from Class A and Class B ...read more

A class is a blueprint for creating objects in object-oriented programming.

• Classes define the properties and behaviors of objects.

• To create a class, use the 'class' keyword followed by the class name and curly braces.

• Inside the class, you can define attributes (variables) and methods (functions).

• Example: class Car { String color; void start() { //code here } }

Polymorphism is a concept in object-oriented programming where a single function or method can operate on different types of data.

• Polymorphism allows for flexibility and reusability in code

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding)

• Example: a function that can calculate the area of different shapes (circle, square, triangle) based on the input type

Data types are classifications that specify which type of value a variable can hold.

• Data types include integers, floating point numbers, characters, strings, and booleans.

• Examples of data types are int (for integers), float (for floating point numbers), char (for characters), and bool (for booleans).

Join in SQL is used to combine rows from two or more tables based on a related column between them.

• Join is used to retrieve data from multiple tables based on a related column

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column