Palsons Derma Interview Questions and Answers

Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in child class with the same name and signature as in parent class.

• Overloading is compile-time polymorphism while overriding is runtime polymorphism.

• Overloading is done in the same class while overriding is done in different classes.

• Overloading is used to provide different implementations of the same method while overriding is used to provide a specific implementa...read more

Object is an instance of a class that has its own set of properties and methods. A class is a blueprint for creating objects.

• An object is a real-world entity with its own set of attributes and behaviors.

• A class is a template or blueprint for creating objects.

• Objects are created from classes using the 'new' keyword.

• Classes can have properties (variables) and methods (functions).

• Inheritance allows classes to inherit properties and methods from parent classes.

• Polymorphism allows...read more

Union and intersection are set operations used in mathematics and computer science.

• Union combines two sets and removes duplicates

• Intersection returns the common elements between two sets

• Example of union: {1,2,3} union {3,4,5} = {1,2,3,4,5}

• Example of intersection: {1,2,3} intersection {3,4,5} = {3}

Trigger is a database object that executes automatically in response to certain events. Cursor is a database object used to manipulate data.

• Triggers are used to maintain data integrity and consistency.

• Triggers can be used to audit changes made to the database.

• Cursors are used to iterate through a set of rows returned by a query.

• Cursors can be used to update or delete rows in a table.

• Triggers and cursors are commonly used in database programming.

Encapsulation is the process of hiding implementation details and exposing only necessary information.

• Encapsulation helps in achieving data abstraction and information hiding.

• It allows for better control over data and prevents unauthorized access.

• An example of encapsulation is a class in object-oriented programming, where the data members are private and can only be accessed through public methods.