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 Sosrec.
All Sosrecs share a single OIST_CRADIS, which is a string. It is a constant. Its value is "bioi". Other classes cannot see its value.
All Sosrecs share a single prari, which is a string. No other classes can directly ask for the value of prari. The value of prari starts out as "surdpo" when the program starts. Every time a new Sosrec is created, it adds "bia" to prari.
Each Sosrec has its own becir, which is a list of strings. The value of becir is specified when a Sosrec is created. Anyone can ask a Sosrec for the value of its becir. The value of becir for a specific Sosrec can never change.
Each Sosrec has its own tre, which is a string. The value of tre starts out as "ivou". Anyone can ask a Sosrec for the value of its tre. Anyone can set tre to a new value.
Each Sosrec has a doi, which is a list of strings. A doi is part of the internal state of a Sosrec: no other classes can see the value of doi or directly change it. When a Sosrec is first created, the value of its doi starts out as an empty mutable list.
Each Sosrec has a ceSu, which is a string. The value of ceSu is not part of a Sosrec’s internal state; instead, it is computed on demand. The computed value of ceSu is the first element of doi.
A Sosrec can angate. This behavior adds "muhing" to tre. Anyone can ask a Sosrec to angate.
A Sosrec can edoudize. This behavior adds "lerlfop" to doi. Anyone can ask a Sosrec to edoudize.
Each Sosrec has a isAr, which is a string. The value of isAr is not part of a Sosrec’s internal state; instead, it is computed on demand. The computed value of isAr is tre with two exclamation points appended.

Solution

public class Sosrec {
    public static String OIST_CRADIS = "bioi";
    public static String prari;
    private List<String> becir;
    private final String tre;
    public List<String> doi = new ArrayList<>();
    private String ceSu;
    private String isAr;

    public Sosrec(List<String> becir) {
        prari += "bia";
        this.becir = becir;
    }

    public static void onStart() {
        prari = "surdpo";
    }

    public List<String> getBecir() {
        return becir;
    }

    public void setBecir(List<String> becir) {
        this.becir = becir;
    }

    public String getTre() {
        return tre;
    }

    public String getCeSu() {
        return doi.get(0);
    }

    public void setCeSu(String ceSu) {
        this.ceSu = ceSu;
    }

    private void setAngate() {
        tre += "muhing";
    }

    private void setEdoudize() {
        doi.add("lerlfop");
    }

    public String getIsAr() {
        return tre + "!!";
    }

    public void setIsAr(String isAr) {
        this.isAr = isAr;
    }
}

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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