Fields (instance variables)

Fields (also called instance variables) store the state of an object. Each object gets its own copy of these variables.

Declaration:

class Car {
    String model;      // instance variable
    int year;          // instance variable
    double price;      // instance variable
}

Initialization:

Fields can be initialized at declaration or in constructors.

class Car {
    String model = "Unknown";
    int year;

    Car(int year) {
        this.year = year;
    }
}

Default values: If not initialized, fields get default values (0, false, null, etc.).

Access:

Car myCar = new Car();
myCar.model = "Tesla";
System.out.println(myCar.year);

Field modifiers: