???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????е??TestPeople????TestStudent ???￡?
????public class TestStudent extends TestPeople {
????/**
????* ????θ??Bar???????????????
????* @param foo
????* @return
????*/
????@Override  //????????? method does not override from its supperclass
????Bar test(Bar foo) {
????return new Bar();
????}
????}
????????? ????????????:
????1. ?????????????????????????.
????2. ??????????豣?????????????????????????
??????????2????????????
????3. ????????????з???????????????е?????????????
????4. ????????????????????????????????????????????????????