Class declarations and object modeling: Correct Solution


Translate the specification below into an idiomatic Java class definition.

(In this context, "idiomatic" means following the common style and conventions of the language.)

  1. One kind of thing that exists in our model is a Blocus.

  2. Each Blocus has its own feca, which is a list of strings. The value of feca starts out as an empty mutable list. Anyone can ask a Blocus for the value of its feca. Anyone can set feca to a new value.

  3. Each Blocus has its own wusm, which is a graphics object. The value of wusm is specified when a Blocus is created. Anyone can ask a Blocus for the value of its wusm. The value of wusm for a specific Blocus can never change.

  4. Each Blocus has a pri, which is an int. The value of pri is not part of a Blocus’s internal state; instead, it is computed on demand. The computed value of pri is the x position of wusm.

Solution

public class Blocus {
    private final List<String> feca;
    private GraphicsObject wusm;
    private int pri;

    public Blocus(GraphicsObject wusm) {
        this.wusm = wusm;
    }

    public List<String> getFeca() {
        return feca;
    }

    public GraphicsObject getWusm() {
        return wusm;
    }

    public void setWusm(GraphicsObject wusm) {
        this.wusm = wusm;
    }

    public int getPri() {
        return wusm.getX();
    }

    public void setPri(int pri) {
        this.pri = pri;
    }
}

Things to check in your solution:

Acceptable variations in the solution:


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