Inheritance & Polymorphism

Inheritance lets a class reuse another class's fields and methods:

class Vehicle { protected String brand = "Ford"; void honk() { System.out.println("Tuut!"); } } class Car extends Vehicle { String model = "Mustang"; }

Car is the subclass (child); Vehicle is the superclass (parent). A Car has brand, model, and honk().

Java allows only one superclass per class. Mark a class final to stop others extending it.