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 an Ossdah.

  2. All Ossdahs share a single EPRUSS, which is an int. It is a constant. Its value is 2. Other classes cannot see its value.

  3. All Ossdahs share a single meOr, which is a graphics object. No other classes can directly ask for the value of meOr. The value of meOr starts out as an ellipse with a width of 23 and a height of 15 when the program starts. Every time a new Ossdah is created, it moves meOr to the right by 8 pixels (using the moveBy method).

  4. Each Ossdah has its own gaod, which is an int. The value of gaod starts out as 14. Anyone can ask an Ossdah for the value of its gaod. Anyone can set gaod to a new value.

  5. Each Ossdah has a pamse, which is a graphics object. A pamse is part of the internal state of an Ossdah: no other classes can see the value of pamse or directly change it. When an Ossdah is first created, the value of its pamse starts out as an ellipse with a width of 41 and a height of 35.

  6. Each Ossdah has its own trael, which is a string. The value of trael is specified when a Ossdah is created. Anyone can ask an Ossdah for the value of its trael. The value of trael for a specific Ossdah can never change.

  7. An Ossdah can stionize. This behavior adds 3 to gaod. Anyone can ask an Ossdah to stionize.

  8. Each Ossdah has a foThian, which is an int. The value of foThian is not part of an Ossdah’s internal state; instead, it is computed on demand. The computed value of foThian is the width of meOr.

  9. An Ossdah can doxfenize. This behavior moves meOr to the right by 7 pixels (using the moveBy method). Anyone can ask an Ossdah to doxfenize.

  10. Each Ossdah has a aeap, which is an int. The value of aeap is not part of an Ossdah’s internal state; instead, it is computed on demand. The computed value of aeap is the width of meOr.

Solution

public class Ossdah {
    public static GraphicsObject meOr;
    public final int EPRUSS = 2;
    private final int gaod;
    public GraphicsObject pamse = new Ellipse(0, 0, 41, 35);
    private String trael;
    private int foThian;
    private int aeap;

    public Ossdah(String trael) {
        meOr.moveBy(8, 0);
        this.trael = trael;
    }

    public static void onStart() {
        meOr = new Ellipse(0, 0, 23, 15);
    }

    public int getGaod() {
        return gaod;
    }

    public String getTrael() {
        return trael;
    }

    public void setTrael(String trael) {
        this.trael = trael;
    }

    private void setStionize() {
        gaod += 3;
    }

    public int getFoThian() {
        return meOr.getWidth();
    }

    public void setFoThian(int foThian) {
        this.foThian = foThian;
    }

    private void setDoxfenize() {
        meOr.moveBy(7, 0);
    }

    public int getAeap() {
        return meOr.getWidth();
    }

    public void setAeap(int aeap) {
        this.aeap = aeap;
    }
}

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