使用构造函数创建Bicycle类

public class Bicycle {


    // the Bicycle class has three fields
    /**
    时 代 J a v a - nowjava.com 提供 
    **/

    public int cadence;

    public int gear;

    public int speed;


    public Bicycle() {

        super();

    }


    public Bicycle(int startCadence, int startSpeed, int startGear) {

        gear = startGear;

        cadence = startCadence;

        speed = startSpeed;

    }
    /**
    来 自 n o w j a   v  a . c o m - 时  代  Java
    **/


    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 is in gear " + this.gear

                + " with a cadence of " + this.cadence

                + " and travelling at a speed of " + this.speed + ". ");

    }


}