本帖最後由 tonyh 於 2015-3-20 18:30 編輯
定義帶不同參數數量的建構子
- public class ch59
- {
- public static void main(String args[])
- {
- Car bus=new Car("公車",6,40);
- Car truck=new Car("卡車",8,3);
- Car taxi=new Car("計程車");
- taxi.wheel=4;
- taxi.carry=5;
- System.out.println(bus.name+"有"+bus.wheel+"個輪子,可載"+bus.carry+"人.");
- System.out.println(truck.name+"有"+truck.wheel+"個輪子,可載"+truck.carry+"人.");
- System.out.println(taxi.name+"有"+taxi.wheel+"個輪子,可載"+taxi.carry+"人.");
- }
- }
- class Car
- {
- String name;
- int wheel, carry;
-
- Car() //不帶任何參數的建構子
- {
- }
-
- Car(String name) //帶有一個參數的建構子
- {
- this.name=name;
- }
- Car(int wheel, int carry) //帶有二個參數的建構子
- {
- this.wheel=wheel;
- this.carry=carry;
- }
- Car(String name, int wheel, int carry) //帶有三個參數的建構子
- {
- this.name=name;
- this.wheel=wheel;
- this.carry=carry;
- }
- }
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