Oracle Software Developer interview questions

The first two interview questions are about design and the last one is one coding questions about graph. It is quite frustrating for the design question since the interviewer did not provide why we need to design the class. It is even frustrating in the third interview where the interviewer does not speak very good English and it is hard to know what the problem is. I would hope they could write down the problem and there should have more time to focus on the problem itself.