Learn what a variable is, how to declare it, what types of variables exist, and what scope and modifiers mean in Java, one of the most popular programming languages.

After declaring a variable, you can optionally initialize it by assigning it an initial value. Uninitialized variables have default values depending on their type.

Starting with Java SE 10, there is a simple alternative to declaring and initializing a variable. In certain contexts, you can replace the variable’s type name with the var keyword, as follows: ...

Classes, fields, methods, constructors, and objects are the building blocks of object-based Java applications. This Java tutorial teaches you how to declare classes, describe attributes via fields ...