Java程序创建String到超类类型的映射
在这里，我们有一个超类Vehicle，在其中一些子类中-
class Vehicle {
}
class Motorcycle extends Vehicle {
}
class Bus extends Vehicle {
}
class Car extends Vehicle {
}现在，我们将创建一些用于映射超类类型的字符串-
Map<String, Vehicle>map = new HashMap<String, Vehicle>();
map.put("motorcycle", new Motorcycle());
map.put("bus", new Bus());
map.put("car", new Car());示例
import java.util.HashMap;
import java.util.Map;
class Vehicle {
}
class Motorcycle extends Vehicle {
}
class Bus extends Vehicle {
}
class Car extends Vehicle {
}
public class Demo {
public static void main(String... args) {
Map<String, Vehicle>map = new HashMap<String, Vehicle>();
map.put("motorcycle", new Motorcycle());
map.put("bus", new Bus());
map.put("car", new Car());
System.out.println(map);
}
}输出结果
{bus=my.Bus@97e1986, car=my.Car@26f67b76, motorcycle=my.Motorcycle@153f5a29}