Validating the implementation of the Decorator Pattern in Java

I am learning hands on implementation of Design Patterns. The following is an implementation of the Decorator Design Pattern. I would like to know if the implementation is correct. Let me know if it can be improved or is incorrect.

interface Markable
{
    void mark();
}
class SingleMarker implements Markable
{

    @Override
    public void mark() {
        System.out.println("Single Marker");

    }
}
class MarkerDecorator implements Markable
{
    protected SingleMarker singleMarker;
    public MarkerDecorator(final SingleMarker singleMarker) {
        this.singleMarker = singleMarker;
    }
    @Override
    public void mark() {
        this.singleMarker.mark();
    }
}
class MultipleMarker extends MarkerDecorator
{
    private int numberOfMarks;
    public MultipleMarker(SingleMarker singleMarker) {
        this(singleMarker, 2);
    }
    public MultipleMarker(SingleMarker singleMarker, int numberOfMarks) {
        super(singleMarker);
        this.numberOfMarks = numberOfMarks;
    }
    @Override
    public void mark() {
        for (int i = 0; i < numberOfMarks; i++) {
            super.singleMarker.mark();
        }
    }

}

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