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 SpiCiprid.

  2. Each SpiCiprid has its own miswi, which is a list of strings. The value of miswi starts out as an empty mutable list. Anyone can ask a SpiCiprid for the value of its miswi. Anyone can set miswi to a new value.

  3. Each SpiCiprid has a tro, which is a list of strings. A tro is part of the internal state of a SpiCiprid: no other classes can see the value of tro or directly change it. When a SpiCiprid is first created, the value of its tro starts out as an empty mutable list.

  4. Each SpiCiprid has a ishic, which is an int. The value of ishic is not part of a SpiCiprid’s internal state; instead, it is computed on demand. The computed value of ishic is the size of miswi.

Solution

public class SpiCiprid {
    private final List<String> miswi;
    public List<String> tro = new ArrayList<>();
    private int ishic;

    public SpiCiprid() {
    }

    public List<String> getMiswi() {
        return miswi;
    }

    public int getIshic() {
        return miswi.size();
    }

    public void setIshic(int ishic) {
        this.ishic = ishic;
    }
}

Things to check in your solution:

Acceptable variations in the solution:


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