public interface PetOutput{

    void sound();

}

public class Dog implements PetOutput{

    private String name;

    private String breed;

public Dog (String  aName){

    name=aName;

    breed="哈巴犬"；

}

public Dog (String aName, String aBreed){

    name=aName;

    breed=aBreed;

}

public void training(){

   System.out.println("汪汪汪汪汪......");

}

public String toString(){

         return"它的名字"+name+",它是"+breed;

}

}