public String printParkInfo() {
		String text="";

		if(park == null && getParkBoyList().size() == 0) {
			text="目前没有管理任何停车场！" ;
			
			return text;
			
		}
		int emptyNum = 0;
		int totalNum = 0;
		
		if(park != null) {
			text= "        停车场编号：" + park.getCode() +"\n";
			text=text+ "        停车场名称：" + park.getParkName() +"\n";
			text=text+"                车位数：" + park.getTotalNum()+"\n";
			text=text+"                空位数：" + park.getEmptyNum()+"\n";
			emptyNum += park.getEmptyNum();
			totalNum += park.getTotalNum();
		}
		for(int i = 0; i < getParkBoyList().size(); i ++) {
			ParkBoy boy = getParkBoyList().get(i);
			text=text+"        停车BOY编号：" + boy.getCode()+"\n";
			text=text+"        停车BOY名称：" + boy.getName()+"\n";
			text =text + boy.printParkInfo();
			emptyNum += boy.getEmptyNum();
			totalNum += boy.getTotalNum();
		}
		text =text + "        共计车位数：" + totalNum+"\n";
		text =text + "        共计空位数：" + emptyNum+"\n";
		return text;
	}