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Variables

As you learned in the previous lesson, an object stores its state in fields.

int cadence = 0; int speed = 0; int gear = 1;

The What Is an Object?

discussion introduced you to fields, but you probably have still a few questions, such as: What are the rules and conventions for naming a field? Besides , what other data types are there?

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Java compiler

Do fields have to be initialized when they are declared? Are fields assigned a default value if they are not explicitly initialized? We'll explore the answers to such questions in this lesson, but before we do, there are a few technical distinctions you must first become aware of.

In the Java programming language, the terms "field" and "variable" are both used; this is a common source of confusion among new developers, since both often seem to refer to the same thing.

The Java programming language defines the following kinds of variables:

Instance Variables (Non-Static Fields) Technically speaking, objects store their individual states in "non-static fields", that is, fields declared without