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

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