The introduction to object-oriented concepts in the lesson titled Object-oriented Programming Concepts <\/A>used a bicycle class as an example, with racing bikes, mountain bikes, and tandem bikes as subclasses. Here is sample code for a possible implementation of a Bicycle<\/CODE> class, to give you an overview of a class declaration. Subsequent sections of this lesson will back up and explain class declarations step by step. For the moment, don`t concern yourself with the details.
\npublic class Bicycle {
\/\/ the Bicycle class has three fields
<\/I><\/B> public int cadence;
public int gear;
public int speed;
\/\/ the Bicycle class has one constructor
<\/I><\/B> public Bicycle(int startCadence, int startSpeed, int startGear) {
gear = startGear;
cadence = startCadence;
speed = startSpeed;
}
\/\/ the Bicycle class has four methods
<\/I><\/B> 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;
}
}<\/PRE><\/BLOCKQUOTE>
\nA class declaration for a MountainBike<\/CODE> class that is a subclass of Bicycle<\/CODE> might look like this: <\/P>
\npublic class MountainBike extends Bicycle {
\/\/ the MountainBike subclass has one field
<\/I><\/B> public int seatHeight;
\/\/ the MountainBike subclass has one constructor
<\/I><\/B> public MountainBike(int startHeight, int startCadence, int startSpeed, int startGear) {
super(startCadence, startSpeed, startGear);
seatHeight = startHeight;
}
\/\/ the MountainBike subclass has one method
<\/I><\/B> public void setHeight(int newValue) {
seatHeight = newValue;
}
}<\/PRE><\/BLOCKQUOTE>MountainBike<\/CODE> inherits all the fields and methods of Bicycle<\/CODE> and adds the field seatHeight<\/CODE> and a method to set it (mountain bikes have seats that can be moved up and down as the terrain demands). <\/BLOCKQUOTE><\/DIV>
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