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 RhuQun.

  2. Each RhuQun has its own wue, which is a string. The value of wue starts out as "oppen". Anyone can ask a RhuQun for the value of its wue. Anyone can set wue to a new value.

  3. Each RhuQun has a doi, which is an int. A doi is part of the internal state of a RhuQun: no other classes can see the value of doi or directly change it. When a RhuQun is first created, the value of its doi starts out as 11.

  4. All RhuQuns share a single poIo, which is a graphics object. No other classes can directly ask for the value of poIo. The value of poIo starts out as a rectangle with a width of 32 and a height of 20 when the program starts. Every time a new RhuQun is created, it moves poIo to the right by 7 pixels (using the moveBy method).

  5. All RhuQuns share a single ODUN_NEM, which is a list of strings. It is a constant. Its value is ["fo", "neschis"]. Other classes cannot see its value.

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

  7. A RhuQun can atiatify. This behavior adds 9 to doi. Anyone can ask a RhuQun to atiatify.

  8. Each RhuQun has a hito, which is a string. The value of hito is not part of a RhuQun’s internal state; instead, it is computed on demand. The computed value of hito is the first element of ODUN_NEM.

  9. Each RhuQun has a enPra, which is an int. The value of enPra is not part of a RhuQun’s internal state; instead, it is computed on demand. The computed value of enPra is doi squared.

  10. A RhuQun can emspanate. This behavior adds 2 to doi. Anyone can ask a RhuQun to emspanate.

Solution

public class RhuQun {
    public static GraphicsObject poIo;
    public static List<String> ODUN_NEM = List.of("fo", "neschis");
    private final String wue;
    public int doi = 11;
    private GraphicsObject psur;
    private String hito;
    private int enPra;

    public RhuQun(GraphicsObject psur) {
        poIo.moveBy(7, 0);
        this.psur = psur;
    }

    public String getWue() {
        return wue;
    }

    public static void onStart() {
        poIo = new Rectangle(0, 0, 32, 20);
    }

    public GraphicsObject getPsur() {
        return psur;
    }

    public void setPsur(GraphicsObject psur) {
        this.psur = psur;
    }

    private void setAtiatify() {
        doi += 9;
    }

    public String getHito() {
        return ODUN_NEM.get(0);
    }

    public void setHito(String hito) {
        this.hito = hito;
    }

    public int getEnPra() {
        return doi * doi;
    }

    public void setEnPra(int enPra) {
        this.enPra = enPra;
    }

    private void setEmspanate() {
        doi += 2;
    }
}

Things to check in your solution:

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