Java pomoc

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Java pomoc

Pozdrav,

 

jel bi mi mogao netko pomoći u vezi komunikacije između dva objekta. Imam klasu Vehicle, koja sadrži varijablu tipa SpeedMeter. Znači HAS-A je veza. Sada me muči na koji način pristupiti i koristiti metode u klasi SpeedMeter, ja sam nešto napravio Primjer2, sad nisam siguran je li to ispravno, ili je pravi način ovaj iz Primjer1? Mislim nemoguce je uraditi u konstruktoru klase SpeedMeter instanciranje klase Vehicle jer je abstract, sad ako netko zna način i ako nije problem objasniti? ako je Primjer2 pogrešan na koji način bi to trebalo raditi?

Unaprijed hvala svima!


/***Primjer1****/
class A

{

    B parent;

    A(B parent)
    {
       this.parent=parent;
    }

}

class B

{

    B()

   {

       A aref=new A(this)

   }

}

/************Primjer 2***/

 

/**Klasa Vehicle***/
abstract public class Vehicle {

private SpeedMeter smc;
private String nameOfVehicle;

public Vehicle(String nameOfVehicle,double maxSpeed)
{
   this.nameOfVehicle=nameOfVehicle;
   smc=new SpeedMeter(maxSpeed);
}

public SpeedMeters getSpeedMeter()
{
    return smc;
}

}
/***Klasa SpeedMeter***/

public class SpeedMeter {

private double vehicleCurSpeed;
private final int MIN_SPEED=0;
private double maxSpeed;

public SpeedMeter(double maxSpeed)
{
   vehicleCurSpeed=0;
   this.maxSpeed=maxSpeed;
}
/***************************************************************/
/** Getter and Setters*/
public void setVehicleCurSpeed(double vehicleCurSpeed)
{
   this.vehicleCurSpeed=vehicleCurSpeed;
}
public double getVehicleCurSpeed()
{
   return vehicleCurSpeed;
}
public double getVehicleMaxSpeed()
{
    return maxSpeed;
}
/** Speed up or speed down *****************/

public void speedUpVehicle(int incre)
{
   if((vehicleCurSpeed+incre) > maxSpeed)
     vehicleCurSpeed=maxSpeed;
   else
     vehicleCurSpeed+=incre;
}
public void speedDownVehicle(int decr)
{
    if((vehicleCurSpeed-decr)<=MIN_SPEED)
     vehicleCurSpeed=MIN_SPEED;
    else
     vehicleCurSpeed=vehicleCurSpeed-decr;
}

Poruka je uređivana zadnji put pet 6.2.2015 1:50 (maliHugo).
 
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