The question makes no sense: it won't "execute", won't even compile.
It could be
class1 myObject = new class1();
And it is irrelevant to interfaces and other content of the "question". I think you should rewind your learning process… somewhere near the very first page. Are you reading some manual, doing simple exercises? Excellent! Now go to the very beginning of the classes chapter. No questions could possibly help you more than that.
—SA