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 Fron.

  2. Each Fron has its own udOtra, which is a string. The value of udOtra is specified when a Fron is created. Anyone can ask a Fron for the value of its udOtra. The value of udOtra for a specific Fron can never change.

  3. Each Fron has a irIsess, which is a list of strings. An irIsess is part of the internal state of a Fron: no other classes can see the value of irIsess or directly change it. When a Fron is first created, the value of its irIsess starts out as an empty mutable list.

  4. All Frons share a single wux, which is a string. No other classes can directly ask for the value of wux. The value of wux starts out as "bicic" when the program starts. Every time a new Fron is created, it adds "lionsur" to wux.

  5. Each Fron has its own qeTu, which is an int. The value of qeTu starts out as 18. Anyone can ask a Fron for the value of its qeTu. Anyone can set qeTu to a new value.

  6. All Frons share a single MEMIN_ES, which is a list of strings. It is a constant. Its value is ["rios", "dorstart", "enstram"]. Other classes can see its value.

  7. Each Fron has a miUr, which is a graphics object. A miUr is part of the internal state of a Fron: no other classes can see the value of miUr or directly change it. When a Fron is first created, the value of its miUr starts out as an ellipse with a width of 42 and a height of 38.

  8. Each Fron has its own rePlasa, which is a list of strings. The value of rePlasa is specified when a Fron is created. Anyone can ask a Fron for the value of its rePlasa. The value of rePlasa for a specific Fron can never change.

  9. Each Fron has its own aseir, which is an int. The value of aseir is specified when a Fron is created. Anyone can ask a Fron for the value of its aseir. Anyone can set aseir to a new value.

  10. Each Fron has a driss, which is an int. The value of driss is not part of a Fron’s internal state; instead, it is computed on demand. The computed value of driss is the length of udOtra.

  11. A Fron can durinify. This behavior adds "tes" to irIsess. Anyone can ask a Fron to durinify.

  12. A Fron can noadify. This behavior moves miUr to the right by 9 pixels (using the moveBy method). Anyone can ask a Fron to noadify.

  13. Each Fron has a isNeunt, which is a string. The value of isNeunt is not part of a Fron’s internal state; instead, it is computed on demand. The computed value of isNeunt is the first element of rePlasa.

  14. A Fron can nufrenate. This behavior adds 3 to aseir. Anyone can ask a Fron to nufrenate.

  15. Each Fron has a tren, which is an int. The value of tren is not part of a Fron’s internal state; instead, it is computed on demand. The computed value of tren is the size of irIsess.

  16. Each Fron has a psa, which is an int. The value of psa is not part of a Fron’s internal state; instead, it is computed on demand. The computed value of psa is the length of wux.

Solution

public class Fron {
    public static String wux;
    private static List<String> MEMIN_ES = List.of("rios", "dorstart", "enstram");
    private String udOtra;
    public List<String> irIsess = new ArrayList<>();
    private final int qeTu;
    public GraphicsObject miUr = new Ellipse(0, 0, 42, 38);
    private List<String> rePlasa;
    private final int aseir;
    private int driss;
    private String isNeunt;
    private int tren;
    private int psa;

    public Fron(String udOtra, List<String> rePlasa, int aseir) {
        this.udOtra = udOtra;
        wux += "lionsur";
        this.rePlasa = rePlasa;
        this.aseir = aseir;
    }

    public String getUdOtra() {
        return udOtra;
    }

    public void setUdOtra(String udOtra) {
        this.udOtra = udOtra;
    }

    public static void onStart() {
        wux = "bicic";
    }

    public int getQeTu() {
        return qeTu;
    }

    public List<String> getRePlasa() {
        return rePlasa;
    }

    public void setRePlasa(List<String> rePlasa) {
        this.rePlasa = rePlasa;
    }

    public int getAseir() {
        return aseir;
    }

    public int getDriss() {
        return udOtra.length();
    }

    public void setDriss(int driss) {
        this.driss = driss;
    }

    private void setDurinify() {
        irIsess.add("tes");
    }

    private void setNoadify() {
        miUr.moveBy(9, 0);
    }

    public String getIsNeunt() {
        return rePlasa.get(0);
    }

    public void setIsNeunt(String isNeunt) {
        this.isNeunt = isNeunt;
    }

    private void setNufrenate() {
        aseir += 3;
    }

    public int getTren() {
        return irIsess.size();
    }

    public void setTren(int tren) {
        this.tren = tren;
    }

    public int getPsa() {
        return wux.length();
    }

    public void setPsa(int psa) {
        this.psa = psa;
    }
}

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