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  1. import java.util.HashMap;
  2. import java.util.Map;
  3.  
  4. // 父类 Car
  5. abstract class Car {
  6.     public abstract void drive();
  7. }
  8.  
  9. // 奔驰
  10. class Benz extends Car {
  11.     @Override
  12.     public void drive() {
  13.         System.out.println("驾驶奔驰出门");
  14.     }
  15. }
  16.  
  17. // 宝马
  18. class BMW extends Car {
  19.     @Override
  20.     public void drive() {
  21.         System.out.println("驾驶宝马出门");
  22.     }
  23. }
  24.  
  25. // 奥迪
  26. class Audi extends Car {
  27.     @Override
  28.     public void drive() {
  29.         System.out.println("驾驶奥迪出门");
  30.     }
  31. }
  32.  
  33. // 理想
  34. class LiXiang extends Car {
  35.     @Override
  36.     public void drive() {
  37.         System.out.println("驾驶理想出门");
  38.     }
  39. }
  40.  
  41. // 管家类
  42. class HouseKeeper {
  43.     private Map<String, Car> carMap = new HashMap<>();
  44.  
  45.     public HouseKeeper() {
  46.         carMap.put("奔驰", new Benz());
  47.         carMap.put("宝马", new BMW());
  48.         carMap.put("奥迪", new Audi());
  49.         carMap.put("理想", new LiXiang());
  50.     }
  51.  
  52.     public void driveCar(String carName) {
  53.         Car car = carMap.get(carName);
  54.         if (car != null) {
  55.             car.drive();
  56.         } else {
  57.             System.out.println("没有找到" + carName);
  58.         }
  59.     }
  60. }
  61.  
  62. // 测试类
  63. public class Main {
  64.     public static void main(String[] args) {
  65.         HouseKeeper keeper = new HouseKeeper();
  66.         keeper.driveCar("宝马");
  67.         keeper.driveCar("理想");
  68.         keeper.driveCar("特斯拉");
  69.     }
  70. }
Success #stdin #stdout 0.14s 57532KB
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驾驶宝马出门
驾驶理想出门
没有找到特斯拉
https://ideone.com/LRdbFn
language:
Java (HotSpot 12)
created:
8 hours ago
visibility:
public

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