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.)

One kind of thing that exists in our model is an Osun.
Each Osun has a swin, which is a string. A swin is part of the internal state of an Osun: no other classes can see the value of swin or directly change it. When an Osun is first created, the value of its swin starts out as "earpse".
All Osuns share a single treli, which is a graphics object. No other classes can directly ask for the value of treli. The value of treli starts out as an ellipse with a width of 24 and a height of 45 when the program starts. Every time a new Osun is created, it moves treli to the right by 5 pixels (using the moveBy method).
Each Osun has a qoEvar, which is an int. The value of qoEvar is not part of an Osun’s internal state; instead, it is computed on demand. The computed value of qoEvar is the x position of treli.

Solution

public class Osun {
    public static GraphicsObject treli;
    public String swin = "earpse";
    private int qoEvar;

    public Osun() {
        treli.moveBy(5, 0);
    }

    public static void onStart() {
        treli = new Ellipse(0, 0, 24, 45);
    }

    public int getQoEvar() {
        return treli.getX();
    }

    public void setQoEvar(int qoEvar) {
        this.qoEvar = qoEvar;
    }
}

Things to check in your solution:

Is every public and private modifier correct?
Are the correct items static?
Are the correct items final?
Are all the variable types and method return types correct?
Are the class members in the correct order? It should be: (1) static variables, (2) instance variables, (3) constructors, (4) methods.
Do members have the correct capitalization?

Acceptable variations in the solution:

It is OK if you initialized non-static variables in the constructor instead of in the declaration. (Ask your instructor if you aren’t clear what this means.) Note that static variables must be initialized in the declaration.
It is OK if you used a slightly different but equivalent form of an expression, such as += 1 instead of ++.

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