LR7

public class TestBikes {
    public static void main(String[] args){
        Bicycle bike01, bike02, bike03;
        RocketBike bike04;

        bike01 = new Bicycle(20, 10, 1);
        bike02 = new MountainBike(20, 10, 5, "Dual");
        bike03 = new RoadBike(40, 20, 8, 23);
        bike04 = new RocketBike(20, 10, 1, 1);

        bike01.printDescription();
        bike02.printDescription();
        bike03.printDescription();

        bike04.speedUp(5);
        bike04.setCadence(15);
        bike04.printDescription();

    }
}


public class Bicycle {
    // the Bicycle class has three fields
    public int cadence;
    public int gear;
    public int speed;

    // the Bicycle class has one constructor
    public Bicycle(int startCadence, int startSpeed, int startGear) {
        gear = startGear;
        cadence = startCadence;
        speed = startSpeed;
    }

    // the Bicycle class has four methods

    public void setCadence(int newValue) {
        cadence = newValue;
    }

    public void setGear(int newValue) {
        gear = newValue;
    }

    public void applyBrake(int decrement) {
        speed -= decrement;
    }

    public void speedUp(int increment) {
        speed += increment;
    }

    public void printDescription() {
        System.out.println("\nBike in gear " + this.gear
                + " with a cadence of " + this.cadence +
                " and travelling at a speed of " + this.speed + ". ");
    }
}


public class MountainBike extends Bicycle {
    private String suspension;
    public MountainBike(
            int startCadence,
            int startSpeed,
            int startGear,
            String suspensionType){
        super(  startCadence,
                startSpeed,
                startGear);
        this.setSuspension(suspensionType);
    }
    public String getSuspension(){
        return this.suspension;
    }
    public void setSuspension(String suspensionType) {
        this.suspension = suspensionType;
    }

    public void printDescription() {
        super.printDescription();
        System.out.println("The " + "MountainBike has a" +
                getSuspension() + " suspension.");
    }
}

public class RoadBike extends Bicycle{
    // In millimeters (mm)
    private int tireWidth;
    public RoadBike(int startCadence,
                    int startSpeed,
                    int startGear,
                    int newTireWidth){
        super(  startCadence,
                startSpeed,
                startGear);
        this.setTireWidth(newTireWidth);
    }
    public int getTireWidth(){
        return this.tireWidth;
    }
    public void setTireWidth(int newTireWidth){
        this.tireWidth = newTireWidth;
    }
    public void printDescription(){
        super.printDescription();
        System.out.println("The RoadBike" + " has " + getTireWidth() +
                " MM tires.");
    }
}

public class RocketBike extends Bicycle {

    private int fuel;
    public String className = "RocketBike";

    public RocketBike(int startCadence,
                      int startSpeed,
                      int startGear,
                      int newFuel) {
        super(startCadence,
                startSpeed,
                startGear);
        this.setFuel(newFuel);
    }


    public int getFuel() {
        return this.fuel;
    }

    public void setFuel(int newFuel) {
        this.fuel = newFuel;
    }

    public void setCadence(int newValue) {
        System.out.print("Setting cadence inside " );
        cadence = newValue;
    }

    public void speedUp(int increment) {
        System.out.println("\nThe " + className + " Speed " + super.speed + "kmh increment by " + increment + " kmh");
        if ((super.speed + increment) > 60) {
            super.speed = 60;
            System.out.println("Reach the speed limit = 60 kmh");
        } else {
            super.speed += increment;
        }
    }

    public void printDescription() {
        super.printDescription();
        System.out.println("The " + className + " has a fuel " + getFuel() +
                " litres.");
    }
}