Variables - Language Basics - Learning the Java Language

Описание: This section introduces variables.
More on storing object states in fields -    • Declaring Classes - Classes - Object-Orien...  
More on static fields (class variables) and non-static fields (instance variables) -    • The static keyword - Understanding Class M...  
More on local variables, fields, and parameters -    • Declaring Member Variables - Classes - OOP...  

Resources:
https://docs.oracle.com/javase/tutori...