package?guoke; public?class?Bus?extends?Vehicle?{?//Bus類繼承?Vehicle類。在Bus.java我還建了其他Vehicle的子類，car,bicycle類 /*問：為什么通過反復調用不同子類的date方法， name,number,way屬性只賦值一次？???我是這樣調用的???Bus?bus=new?Bus();?? ???????????????????????????????????????????????????bus.date(); ???????????????????????????????????????????????????Car?car=new?Car(); ???????????????????????????????????????????????????car.date(); ?結果顯示全是第一次調用的結果，比如上面這樣寫的話，?就是顯示兩次bus的屬性。 ?????????????????????????????????????????????????? */ /*?父類這樣寫的 ?????public?class?Vehicle?{ ?????protected??String?name; ?????protected??int?number; ?????protected??String?way; ?????public??void?date(){ ???? System.out.println("交通工具可以載客"); ?????} } */?? ?????protected??String?name="bus";//屬性 ?????protected??int?number=40; ?????protected??String?way="land"; ?????protected??String?name="bus"; ?????protected??int?number=40; ?????protected??String?way="land"; public?void?date()?{//顯示屬性的值 //?TODO?Auto-generated?constructor?stub System.out.println("公交汽車可以載客："); ???System.out.println(name); ???System.out.println("載客人數number:"+number); ???System.out.println(way); } ?? } class?Car?extends?Vehicle?{?????????//car子類 protected??String?name="car"; ????protected??int?number=4; ????protected??String?way="land"; public?void?date()?{ //?TODO?Auto-generated?constructor?stub System.out.println("轎車可以載客："); ???System.out.println(name); ???System.out.println("載客人數number:"+number); ???System.out.println(way); } class?Bicycle?extends?Vehicle?{????//Bicycle子類 protected??String?name="bicycle"; ???protected??int?number=2; ???protected??String?way="land"; public?void?date()?{ //?TODO?Auto-generated?constructor?stub System.out.println("自行車可以載客："); ???System.out.println(name); ???System.out.println("載客人數number:"+number); ???System.out.println(way); ? }