多态的记录

1 public abstract class Car {
2 
3     public abstract String getCarName();
4 
5 }

1 public class BYD extends Car {
2 
3     @Override
4     public String getCarName() {
5         return "比亚迪";
6     }
7 
8 }

public class JL extends Car {

    @Override
    public String getCarName() {
        return "吉利";
    }

}

 1 public class CarFactory {
 2 
 3     public static Car getCarName(String name) {
 4         Car car = null;
 5         switch (name) {
 6         case "BYD":
 7             car = new BYD();
 8             break;
 9         case "JL":
10             car = new JL();
11             break;
12         default:
13             break;
14         }
15         return car;
16     }
17 }

1 public class CarTest {
2 
3     public static void main(String[] args) {
4         Car byd = CarFactory.getCarName("BYD");
5         System.out.println(byd.getCarName());
6         Car jl = CarFactory.getCarName("JL");
7         System.out.println(jl.getCarName());
8     }
9 }

输出信息：

比亚迪
吉利