这段代码为啥输不出内容呢？

Question

1.写了一段代码，但是为啥输不出内容呢？2.import java.util.HashMap;public class House {private String name;private HashMap<String,House> has=new HashMap<String,House>();public House(String name){this.name=name;}public void setExit(String dir,House house){has.put(dir,house);}public String getExitDes(){   StringBuffer buffer=new StringBuffer();   for(String s:has.keySet()){        buffer.append(s);        buffer.append(has.get(s));    }   return buffer.toString();}public static void main(String[] args){   House house=new House("卧室");    House house1=new House("厨房");    House house2=new House("客厅");    house.setExit("left", house1);    house.setExit("right", house2);    System.out.print(house.getExitDes());}}3.运行后，输出：[e-mail]@15db9742没有输出房间的信息？？

Answer 1

重写toString方法

@Overridepublic String toString() {    return "House [name=" + name + "]";
}