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 a CakPrucor.
All CakPrucors share a single HEA_SOMOL, which is a string. It is a constant. Its value is "hidsar". Other classes can see its value.
Each CakPrucor has a vecba, which is an int. A vecba is part of the internal state of a CakPrucor: no other classes can see the value of vecba or directly change it. When a CakPrucor is first created, the value of its vecba starts out as 12.
All CakPrucors share a single scin, which is an int. No other classes can directly ask for the value of scin. The value of scin starts out as 15 when the program starts. Every time a new CakPrucor is created, it adds 5 to scin.
Each CakPrucor has its own rac, which is a list of strings. The value of rac is specified when a CakPrucor is created. Anyone can ask a CakPrucor for the value of its rac. The value of rac for a specific CakPrucor can never change.
Each CakPrucor has a roErfo, which is an int. The value of roErfo is not part of a CakPrucor’s internal state; instead, it is computed on demand. The computed value of roErfo is vecba squared.
A CakPrucor can cecate. This behavior adds 5 to vecba. Anyone can ask a CakPrucor to cecate.
Each CakPrucor has a sqol, which is a string. The value of sqol is not part of a CakPrucor’s internal state; instead, it is computed on demand. The computed value of sqol is the first element of rac.

Solution

public class CakPrucor {
    private static String HEA_SOMOL = "hidsar";
    public static int scin;
    public int vecba = 12;
    private List<String> rac;
    private int roErfo;
    private String sqol;

    public CakPrucor(List<String> rac) {
        scin += 5;
        this.rac = rac;
    }

    public static void onStart() {
        scin = 15;
    }

    public List<String> getRac() {
        return rac;
    }

    public void setRac(List<String> rac) {
        this.rac = rac;
    }

    public int getRoErfo() {
        return vecba * vecba;
    }

    public void setRoErfo(int roErfo) {
        this.roErfo = roErfo;
    }

    private void setCecate() {
        vecba += 5;
    }

    public String getSqol() {
        return rac.get(0);
    }

    public void setSqol(String sqol) {
        this.sqol = sqol;
    }
}

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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