Java Variables A variable in Java is a container that holds data during program execution. Each variable has a name, data type, and value . 1. Declaration and Initialization Before a variable can be used, it must be declared, which involves specifying its data type and a unique name. int age = 25; // declaration + initialization String name = "Test"; double salary; // only declaration salary = 500.50; // initialization later 2. Types of Variables Local Variable → Variables declared inside a method/block/constructor. Instance Variable → Variables declared inside a class but outside methods (object-specific). Static Variable → Variables declared with static , shared across all objects. class Employee { String name; // instance variable static String company = "XYZ Ltd"; // static variable voi...