public?class?Vehicle?{
int?people;
double?price;
String?sp;
???public?Vehicle(int?people,?double?price,?String?sp){
???????this.people?=?people;
???????this.price?=?price;
???????this.sp?=?sp;
???}
???public?void?use(){
???????System.out.println("**功能**??"?+?"載客:"?+?people?+"??價格:"?+?price);
???????System.out.println("到達目的地時間"?+?sp);
???}
}

子類1：

public?class?Car?extends?Vehicle?{
????public?Car(int?people,?double?price,?String?sp){
????????super(people,?price,?sp);
????}
}

子類2:

public?class?Boat?extends?Vehicle?{
??public?Boat(int?people,?double?price,?String?sp){
??????super(people,?price,?sp);
??}
}

子類3：

public?class?Plane?extends?Vehicle?{
????public?Plane(int?people,?double?price,?String?sp){
????????super(people,?price,?sp);
????}
}

main函數：

public?class?Main?{
????public?static?void?main(String?args[]){
????????Vehicle?car?=?new?Car(4,23.4,"4小時");
????????Car?car2?=?new?Car(5,20.2,"也是4小時");
????????Boat?boat?=?new?Boat(100,40.0,"3小時");
????????Plane?plane?=?new?Plane(200,345.5,"1小時");
????????car.use();
????????car2.use();
????????boat.use();
????????plane.use();
????}
}

運行結果：

**功能**? 載客:4? 價格:23.4

到達目的地時間4小時

**功能**? 載客:5? 價格:20.2

到達目的地時間也是4小時

**功能**? 載客:100? 價格:40.0

到達目的地時間3小時

**功能**? 載客:200? 價格:345.5

到達目的地時間1小時