Variables, Data Types, and Operators in Java
Chapter 4: Variables, Data Types, and Operators in Java Chapter 4: Variables, Data Types, and Operators in Java In this chapter, we’ll dive into the foundational elements of Java: variables , data types , and operators . Understanding these concepts is essential to start writing functional Java programs. 1. Java Variables Variables are containers for storing data values. In Java, you must declare a variable before you use it. int age = 25; String name = "John"; Here, int and String are data types, while age and name are variable names. Types of Variables Local Variable – Declared inside a method. Instance Variable – Declared inside a class but outside any method. Static Variable – Declared with the static keyword. 2. Java Data Types Java is a statically typed language, meaning all variables must be declared with a data type. Primitive Data Types byte – 1 byte, range: -128 to 127 ...