@Override
	public String diplay(int depth) {
		String str="";
        String hole_table="";
		for(int j=0;j<depth;j++)
		{
            hole_table+= str+"停车仔编号: "+this.name+"\n";
			str+="\t";
		}
		for(int i=0;i<this.park_list.size();i++)
		{
            hole_table+=this.park_list.get(i).diplay(depth+1);
		}
            hole_table+=str+"Total车位数: "+this.getTotalnumber()+"\n"+
                    str+"Total空位数: "+this.getEmptySpace()+"\n";
        return hole_table;
	}