Hi,
I read section 5, oop, of the R lang doc, and I am still not sure I
understand how to build a class in R for oop. I thought that since I
understand the oop syntex of Java and VB, I am wondering if the R programmig
experts could help me out by comparing and contrasting the oop syntex in R
with that of Java. For example, the basic class structure in Java is like
this:
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;
}
}
Could one of the R experts please illustrate the R class syntex for writing
the R equivalent of the Java Bicycle class above?
Also, in Java, inheritance is done like this:
public class MountainBike extends Bicycle {
// *the MountainBike subclass has one field*
public int seatHeight;
// *the MountainBike subclass has one constructor*
public MountainBike(int startHeight, int startCadence, int startSpeed,
int startGear) {
super(startCadence, startSpeed, startGear);
seatHeight = startHeight;
}
// *the MountainBike subclass has one method*
public void setHeight(int newValue) {
seatHeight = newValue;
}
}
What would be the R oop syntex for inheritance in the case of the
MontainBike class?
Thanks!
--
Tom
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