Java programming concepts: Class, Object, variables, methods, Packages

Class and Object

A class is a blueprint defining fields and methods; an object is a specific instance created from that class using the new keyword.

Variables and Methods

Variables store data (like int age = 25;), while methods define reusable blocks of behavior (like calculateTotal()).

Packages

Packages group related classes together, keeping large projects organized (e.g., com.company.tests), and are declared at the top of a Java file with package com.company.tests;