Variable arguments in java constructor

Question

Ho can I implement a Car class in the sample below. I can pass a collection with wheel to brand mapping but is there a better way of doing it?

A Car has an engine and some number of wheels. Not all cars are built to hold four wheels, some have only three while others have more. But whatever they are built for, that is the max number they can hold.When a car is built (i.e. constructed), an engine is created for it and so are the wheels that it will use.

Here you got something to read janeg.ca/scjp/overload/poly.html — nist
– nist, Commented Feb 26, 2012 at 21:15

Hunter McMillen · Accepted Answer · 2012-02-26 21:13:31Z

4

public class Car
{
    private Engine      e;
    private int         numWheels;
    private List<Wheel> wheels;

    public Car(Engine e, int numWheels, ...)
    {
       this.e         = e;
       this.numWheels = numWheels;
       this.wheels    = new ArrayList<>();

       for(int i = 0; i < this.numWheels; i++)
       {
           this.wheels.add(new Wheel(...));
       }
    }
}

Just add an integer that holds the number of wheels THIS Car object can have. Then loop through in the constructor and add those wheels

answered Feb 26, 2012 at 21:13

Hunter McMillen

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2 Comments

Peter Lawrey Over a year ago

I assume the collection contains the wheel's brands as well.

Hunter McMillen Over a year ago

I had imagined that each Wheel object would have its own brand attribute.

Peter Lawrey · Accepted Answer · 2012-02-26 21:14:23Z

0

There are many ways to do this, but there is not enough information to say which might be better.

I suggest you do what you believe is the simplest and clearest, and if passing a collection works for you, do that.

answered Feb 26, 2012 at 21:14

Peter Lawrey

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