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 an Irant.

2. All Irants share a single entde, which is a list of strings. No other classes can directly ask for the value of entde. The value of entde starts out as an empty mutable list when the program starts. Every time a new Irant is created, it adds "ungos" to entde.

3. Each Irant has its own coind, which is a string. The value of coind is specified when a Irant is created. Anyone can ask an Irant for the value of its coind. The value of coind for a specific Irant can never change.

4. Each Irant has a biad, which is an int. The value of biad is not part of an Irant’s internal state; instead, it is computed on demand. The computed value of biad is the length of coind.

Solution

public class Irant {
    public static List<String> entde;
    private String coind;
    private int biad;

    public Irant(String coind) {
        entde.add("ungos");
        this.coind = coind;
    }

    public static void onStart() {
        entde = new ArrayList<>();
    }

    public String getCoind() {
        return coind;
    }

    public void setCoind(String coind) {
        this.coind = coind;
    }

    public int getBiad() {
        return coind.length();
    }

    public void setBiad(int biad) {
        this.biad = biad;
    }
}

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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