What are instance variables in Java?

What are instance variables in Java?

Instance variables are variables defined in a class but outside any method. They are specific to each instance of the class.

Can you give me an example of how to use instance variables?

Sure! Here's a simple example:

class Dog {
    String name; // instance variable
    int age; // instance variable

    Dog(String name, int age) {
        this.name = name;
        this.age = age;
    }
}

In this example, name and age are instance variables.

How do instance variables differ from local variables?

Instance variables are tied to a specific object and can be accessed by all methods in the class, while local variables are defined within a method and can only be accessed within that method.

Are instance variables initialized automatically?

Yes, instance variables are automatically initialized to default values (e.g., null for objects, 0 for integers) if not explicitly initialized.