Practice›Java Fundamentals›Module 9. Generics›9.1 Generic classes

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9.1 Generic classes — write a generic Holder

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Task

Write the generic class Holder<T>. It stores one value of type T, set by the constructor, with getValue() returning it and setValue(T value) replacing it.

Use the type parameter T, not Object — main builds a Holder of Strings and one of Integers from the same class.

Your solution

class Holder<T> {
    // a field of type T, a constructor, then getValue and setValue

}

public class Main {
    public static void main(String[] args) {
        Holder<String> h = new Holder<String>("x");
        System.out.println(h.getValue());
        h.setValue("y");
        System.out.println(h.getValue());
        Holder<Integer> n = new Holder<Integer>(5);
        System.out.println(n.getValue());
    }
}

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