What Is Inheritance?

// Base class - Bicycle (Superclass)
public class Bicycle {
// Protected fields - accessible by subclasses
    protected int speed = 0;
    protected int cadence = 0;
    protected int gear = 1;
// Constructor
    public  Bicycle(int startCadence, int startSpeed, int startGear) {
        this.cadence = startCadence;
        this.speed = startSpeed;
        this.gear = startGear;
    }
// Methods inherited by all subclasses
    public void setCadence(int newValue) {
        cadence = newValue;
    }
    public void setGear(int newValue) {
        gear = newValue;
    }
    public void speedUp(int increment) {
        speed += increment;
    }
    public void brake(int decrement) {
        speed -= decrement;
    }
}
// Subclass - MountainBike extends Bicycle
public class MountainBike extends Bicycle {
    private boolean hasExtraChainRing;
    public  MountainBike(int startCadence, int startSpeed, int startGear) {
        super(startCadence, startSpeed, startGear); // Call parent constructor
        this.hasExtraChainRing = true;
    }
// Unique method for MountainBike
    public void setExtraChainRing(boolean value) {
        hasExtraChainRing = value;
    }
}
// Subclass - RoadBike extends Bicycle
public class RoadBike extends Bicycle {
    private boolean hasDropHandlebars;
    public  RoadBike(int startCadence, int startSpeed, int startGear) {
        super(startCadence, startSpeed, startGear); // Call parent constructor
        this.hasDropHandlebars = true;
    }
// Unique method for RoadBike
    public void setDropHandlebars(boolean value) {
        hasDropHandlebars = value;
    }
}
// Subclass - TandemBike extends Bicycle
public class TandemBike extends Bicycle {
    private int numberOfSeats = 2;
    public  TandemBike(int startCadence, int startSpeed, int startGear) {
        super(startCadence, startSpeed, startGear); // Call parent constructor
    }
// Unique method for TandemBike
    public void setNumberOfSeats(int seats) {
        numberOfSeats = seats;
    }
}