Capgemini Interview Questions, Process, and Tips

Object-oriented programming concepts in Java

• Oops stands for Object-oriented programming

• It involves concepts like classes, objects, inheritance, polymorphism, encapsulation

• Java is an object-oriented programming language

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

Polymorphism in Java allows objects of different classes to be treated as objects of a common superclass.

• Polymorphism is achieved through method overriding and method overloading.

• Method overriding allows a subclass to provide a specific implementation of a method that is already provided by its superclass.

• Method overloading allows multiple methods with the same name but different parameters to coexist in the same class...read more

Java datatypes are used to define the type of data that a variable can hold.

• Java has two categories of datatypes: primitive and non-primitive

• Primitive datatypes include int, double, char, boolean, etc.

• Non-primitive datatypes include classes, interfaces, arrays, etc.

• Each datatype has a specific size and range of values it can hold

SQL data types define the type of data that can be stored in a database table columns.

• SQL data types include numeric, character, date/time, and binary types

• Examples: INT, VARCHAR, DATE, BLOB

• Data types determine the storage format, constraints, and operations that can be performed on the data

Object-oriented programming concepts in Java

• Encapsulation: bundling data and methods together

• Inheritance: creating new classes from existing ones

• Polymorphism: using a single interface to represent multiple types

• Abstraction: hiding implementation details

• Encapsulation: grouping related data and methods into a class

• Association: relationship between two or more objects

• Composition: creating complex objects by combining simp...read more