Toy Factory

Factory is a design pattern in common usage. Please implement a ToyFactory which can generate proper toy based on the given type.

Example

ToyFactory tf = ToyFactory();
Toy toy = tf.getToy('Dog');
toy.talk();
>> Wow

toy = tf.getToy('Cat');
toy.talk();
>> Meow

加了一个Enum来表示不用的ToyType; 可以不加直接上String

 /**
  * Your object will be instantiated and called as such:
  * ToyFactory tf = new ToyFactory();
  * Toy toy = tf.getToy(type);
  * toy.talk();
  */
 interface Toy {
     void talk();
 }

 class Dog implements Toy {
     // Write your code here
     @Override
     public void talk(){
         System.out.println("Wow");
     }
 }

 class Cat implements Toy {
     // Write your code here
     @Override
     public void talk(){
         System.out.println("Meow");
     }
 }

 public class ToyFactory {
     /**
      * @param type a string
      * @return Get object of the type
      */
     public Toy getToy(String type) {
         // Write your code here
         ToyType t = ToyType.fromString(type);
         switch (t){
             case DOG: return new Dog();
             case CAT: return new Cat();
             default: return null;
         }
     }

     public enum ToyType {

         DOG("Dog"), CAT("Cat"), UNKNOWN("UNKNOWN");

         private String name;

         private ToyType(String name) {
             this.name = name;
         }

         public static ToyType fromString(String name) {
             for (ToyType toyType : ToyType.values()) {
                 if (toyType.getName().equals(name)) {
                     return toyType;
                 }
             }
             return UNKNOWN;
         }

         private String getName(){
             return name;
         }
     }
 }