其余功能都能实现，只有菜品删除功能不能实现，请检查代码

谢谢老师，添加了break可以跑得通了，而且我也增加了if判断；

但是我又遇到了一个新的问题， 似乎当我按顺序添加菜品时，我只能按顺序删除，比如我添加了1号和2号菜品，我只能先删除1号，再删除2号，这让我很费解

贴上新的代码

菜品处理类

package com.imooc.servlet;
import com.imooc.domain.FoodInfo;
import java.util.*;
//菜品信息处理类
public class FoodDaoImpl {
	private static final List<FoodInfo> db=new ArrayList<>();
    //添加新菜品	
    public static void addFood(FoodInfo food) {
       db.add(food);
    }
    //获得所有菜品信息
	public static List<FoodInfo> getAllFood(){
		return db;
	}
	//根据菜品名称查询菜品信息
    public static List<FoodInfo> getFoodByName(String foodName){
    	   List<FoodInfo> result=new ArrayList<>();
    	   for(FoodInfo food:db) {
    		   if(((String)food.getFoodName()).equals(foodName)) result.add(food);
    	   }
    	   return result;
    }
	//根据菜品id查询菜品信息
    public static List<FoodInfo> getFoodById(String id){
    	   List<FoodInfo> result=new ArrayList<>();
  	   for(FoodInfo food:db) {
  		   if(((String)food.getId()).equals(id)) result.add(food);
  	   }
  	   return result;
    }
	//菜品修改
    public static void updateFood(FoodInfo food) {
	   for(FoodInfo fooditem:db) {
		   if(fooditem.getId().equals(food.getId())) {
			   fooditem.setDescription(food.getDescription());
			   fooditem.setFoodimage(food.getFoodimage());
			   fooditem.setFoodName(food.getFoodName());
			   fooditem.setPrice(food.getPrice());
			   fooditem.setTaste(food.getTaste());
		   }
		   break;
	   }
 }
	//根据菜品ID进行删除
    public static void deleteFoodById(String id) {
    	   for(FoodInfo fooditem:db) {
    		if(((String)fooditem.getId()).equals(id)) db.remove(fooditem);break;
    	   }
    }
	public static void main(String[] args) {
		// TODO Auto-generated method stub

	}

}

servlet的代码

package com.imooc.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.imooc.domain.FoodInfo;


/**
 * 菜品删除servlet
 */
public class FoodDeleteServlet extends HttpServlet {
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");//先进行编码转换后再取数据
		String id=(String)request.getParameter("id").trim();
		List<FoodInfo> list= FoodDaoImpl.getFoodById(id);
		if(list.size()!=0&&list!=null) {
			FoodDaoImpl.deleteFoodById(id);
			response.sendRedirect(request.getContextPath()+"/showFoodList.jsp");
		}
		else {
			request.setAttribute("msg", "不存在该菜品！");
			request.getRequestDispatcher("/deleteById.jsp").forward(request,response);
		}
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.imooc.domain.FoodInfo;

/**

 * 菜品删除servlet

 */

public class FoodDeleteServlet extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");//先进行编码转换后再取数据

String id=(String)request.getParameter("id").trim();

List<FoodInfo> list= FoodDaoImpl.getFoodById(id);

if(list.size()!=0&&list!=null) {

FoodDaoImpl.deleteFoodById(id);

response.sendRedirect(request.getContextPath()+"/showFoodList.jsp");

}

else {

request.setAttribute("msg", "不存在该菜品！");

request.getRequestDispatcher("/deleteById.jsp").forward(request,response);

}

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

// TODO Auto-generated method stub

doGet(request, response);

}

}

再是jsp的代码

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path;
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜品删除(根据ID删)</title>
<style type="text/css">

</style>
</head>
<body>
	<center>
		<h1>菜品删除(根据ID删除)</h1>
		 <%
           String msg="";
           if(request.getAttribute("msg")!=null) {
        	       msg=(String)request.getAttribute("msg");
           }
        %>
        <h3><font color="red" align="center"><%= msg %></font></h3>
		<form action="<%=basePath%>/FoodDeleteServlet" method="post">
			<table width="400px" border="1px" cellspacing="0px" cellpadding="0px">
				<tr>
					<td>菜品ID</td>
					<td><input type="text" name="id"></td>
				</tr>
				<tr>
					<td colspan="2" style="text-align:center"><input type="submit" value="删除"></td>
				</tr>
			</table>
		</form>
	</center>
</body>
</html>