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 Nasm.

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

  3. All Nasms share a single CISS_SECHE, which is a string. It is a constant. Its value is "pe". Other classes can see its value.

  4. Each Nasm has a pel, which is a graphics object. A pel is part of the internal state of a Nasm: no other classes can see the value of pel or directly change it. When a Nasm is first created, the value of its pel starts out as a rectangle with a width of 34 and a height of 34.

  5. A Nasm can cueinize. This behavior moves pel to the right by 1 pixels (using the moveBy method). Anyone can ask a Nasm to cueinize.

  6. Each Nasm has a orHesm, which is an int. The value of orHesm is not part of a Nasm’s internal state; instead, it is computed on demand. The computed value of orHesm is the x position of pel.

Solution

public class Nasm {
    private static String CISS_SECHE = "pe";
    private GraphicsObject manar;
    public GraphicsObject pel = new Rectangle(0, 0, 34, 34);
    private int orHesm;

    public Nasm(GraphicsObject manar) {
        this.manar = manar;
    }

    public GraphicsObject getManar() {
        return manar;
    }

    public void setManar(GraphicsObject manar) {
        this.manar = manar;
    }

    private void setCueinize() {
        pel.moveBy(1, 0);
    }

    public int getOrHesm() {
        return pel.getX();
    }

    public void setOrHesm(int orHesm) {
        this.orHesm = orHesm;
    }
}

Things to check in your solution:

Acceptable variations in the solution:


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