用java实现简易收银台，供大家参考，具体内容如下
简易收银台的实现并不难，主要实现这几个类:
商品类 goods (将商品根据编号,名称,价格存放) 商品中心类 goodscenter (存放商品,可以添加商品,下架商品,修改商品信息,判断商品是否存在或者货架已满,打印商品等功能) 订单类 order (处理订单,主要实现买单功能,下单,计算总价)功能实现
初始化界面
商品上架
修改商品信息
下架商品
返回并进入买单功能
选择商品及数量进行买单
取消订单
查看订单
返回并退出
功能分析
代码展示
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package com.bittech;
import java.time.localdate; import java.util.scanner;
/** * author:weiwei * description: * creat:2019/5/5 **/ public class checkstand {
public static scanner scanner = new scanner(system.in);
public static void helpinfo() { system.out.println( "==============欢迎使用简易收银台=============" ); system.out.println( " [u]使用 [s]设置 [a]关于 [q]退出 " ); system.out.println( " 输入 u s a q 进行操作 " ); system.out.println( "============================================" ); }
public static void quit() { system.out.println( "===========================================" ); system.out.println( " 欢迎下次使用 " ); system.out.println( "===========================================" ); system.exit( 0 ); }
public static void usageinfo() { system.out.println( "================买单功能====================" ); system.out.println( " [s]查看 [a]下单 [d]取消 [l]浏览 [r]返回" ); system.out.println( " 输入 s a d l r 进行操作 " ); system.out.println( "===========================================" );
}
public static void about() { system.out.println( "==================关于=====================" ); system.out.println( " 名称:简易收银台 " ); system.out.println( " 功能:基于字符界面的收银台操作 " ); system.out.println( " 作者:weiwei " ); system.out.println( " 版本:v0.0.1 " ); system.out.println( " 意见反馈:liusz0501@163测试数据 " ); system.out.println( "==========================================" );
}
public static void settinginfo() { system.out.println( "=================设置功能==================" ); system.out.println( " [s]查看 [a]上架 [d]下架 [u]修改 [r]返回 " ); system.out.println( " 输入 s a d u r 进行操作 " ); system.out.println( "===========================================" ); }
public static void usage() { usageinfo(); goodscenter.printgoods(); order order = new order(); while ( true ){ string line = scanner.nextline(); switch (line.trim()){ case "s" :{ order.printorder(); break ; } case "a" :{ system.out.println( "请输入下单信息[编号][数量] (格式如:1 2 ):" ); string value = scanner.nextline(); string[] infoarray = value.split( " " ); if (infoarray != null && (infoarray.length == 2 )){ goods goods = goodscenter.getgoods(integer.parseint(infoarray[ 0 ])); if (goods != null ){ order.add(goods,integer.parseint(infoarray[ 1 ])); order.printorder(); break ; } } system.out.println( "请按照格式要求输入信息" ); break ; } case "d" :{ system.out.println( "请输入取消信息[编号 数量]（如下格式：1 2 ）:" ); string value = scanner.nextline(); string[] infoarray = value.split( " " ); if (infoarray != null && (infoarray.length == 2 )) { goods goods = goodscenter.getgoods(integer.parseint(infoarray[ 0 ])); if (goods != null ) { order.cance(goods, integer.parseint(infoarray[ 1 ])); order.printorder(); break ; } } system.out.println( "请按照格式要求输入信息" ); break ; } case "l" : { goodscenter.printgoods(); break ; } case "r" : { return ; } default : { usageinfo(); } } }
}
public static void setting() { settinginfo(); if (goodscenter.isfull()) { system.out.println( "!当前商品货架已经满了，如果要进行添加请下降部分商品" ); } while ( true ) { string line = scanner.nextline(); switch (line.touppercase()) { case "s" : { goodscenter.printgoods(); break ; } case "a" : { system.out.println( "请输入上架商品信息（如下格式：1 餐巾纸 1.4）:" ); goods goods = readgoods(); if (goods == null ) { system.out.println( "!请按照格式要求输入信息" ); break ; } if (goodscenter.isfull()) { system.out.println( "!当前商品货架已经满了，如果要进行添加请下降部分商品" ); } else if (goodscenter.isexist(goods)) { system.out.println( "!上架商品已经存在，注意编号不能重复" ); } else { goodscenter.addgoods(goods); goodscenter.printgoods(); } break ; } case "d" : { system.out.println( "请输入下架商品信息编号（如下格式：1 ）:" ); goods goods = readgoods(); if (goods == null ) { system.out.println( "请按照格式要求输入信息" ); break ; } if (goodscenter.isputaway(goods)) { goodscenter.soldoutgoods(goods); goodscenter.printgoods(); } else { system.out.println( "请选择上架的商品编号,当前下架商品未设置" ); } break ; } case "u" : { system.out.println( "请输入修改商品信息（如下格式：1 餐巾纸 1.4 ）" ); goods goods = readgoods(); if (goods == null ) { system.out.println( "请按照格式要求输入信息" ); break ; } if (goodscenter.isputaway(goods)) { goodscenter.modifygoods(goods); goodscenter.printgoods(); } else { system.out.println( "请选择上架的商品编号，当前修改商品未设置" ); } break ; } case "r" : { return ; } default : { settinginfo(); } } } }
public static goods readgoods() { string value = scanner.nextline(); string[] infoarray = value.split( " " ); if (infoarray != null && (infoarray.length == 3 || infoarray.length == 1 )) { if (infoarray.length == 3 ) { goods goods = new goods(integer.parseint(infoarray[ 0 ]), infoarray[ 1 ], double .parsedouble(infoarray[ 2 ])); return goods; } if (infoarray.length == 1 ) { goods goods = new goods(integer.parseint(infoarray[ 0 ]), "" , 0 .0d); return goods; } } return null ; }
public static void main(string[] args) { helpinfo(); while ( true ) { string line = scanner.nextline(); switch (line.trim().touppercase()) { case "u" : usage(); helpinfo(); break ; case "s" : setting(); helpinfo(); break ; case "a" : about(); break ; case "q" : quit(); break ; default : helpinfo(); } } } } |
goodscenter类
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class goodscenter { //商品占位符 private static string placeholder = "--" ;
//最大商品数量 private static int maxgoods = 10 ;
//商品容器 private static goods[] goodsarray;
//初始化商品容器 static { goodsarray = new goods[maxgoods]; for ( int i = 0 ; i < goodsarray.length; i++) { goodsarray[i] = new goods(i + 1 , "--" , 0 .0d); } }
private goodscenter() {
}
public static int getmaxgoods() { return maxgoods; }
//添加商品 public static void addgoods(goods goods) { for ( int i = 0 ; i < goodsarray.length; i++) { goods temp = goodsarray[i]; if (temp.getid() == goods.getid()) { temp.setname(goods.getname()); temp.setprice(goods.getprice()); break ; } } }
//下架商品 public static void soldoutgoods(goods goods) { for ( int i = 0 ; i < goodsarray.length; i++) { goods temp = goodsarray[i]; if (temp.getid() == goods.getid()) { temp.setname(placeholder); temp.setprice( 0 .0d); break ; } } }
//修改商品 public static void modifygoods(goods goods) { for ( int i = 0 ; i < goodsarray.length; i++) { goods temp = goodsarray[i]; if (temp.getid() == goods.getid()) { temp.setname(goods.getname()); temp.setprice(goods.getprice()); break ; } } }
//商品是否存在 public static boolean isexist(goods goods) { for ( int i = 0 ; i < goodsarray.length; i++) { goods temp = goodsarray[i]; if (temp.getid() == goods.getid() && temp.getname().equals(goods.getname())) { return true ; } } return false ; }
//商品位是否存在商品 public static boolean isputaway(goods goods) { for ( int i = 0 ; i < goodsarray.length; i++) { goods temp = goodsarray[i]; if (temp.getid() == goods.getid() && !temp.getname().equals(placeholder)) { return true ; } } return false ; }
//商品已满 public static boolean isfull(){ for ( int i = 0 ;i<goodsarray.length;i++){ if (goodsarray[i].getname().equals(placeholder)){ return false ; } } return true ; }
public static goods getgoods( int id){ for ( int i = 0 ;i<goodsarray.length;i++){ goods temp = goodsarray[i]; if (temp.getid() == id && !temp.getname().equals(placeholder)){ return goodsarray[i]; } } return null ; }
//打印商品 public static void printgoods(){ system.out.println( "=============商品清单================" ); system.out.println( "\t" + "编号" + "\t" + "产品名称" + "\t" + "单价" ); for ( int i = 0 ;i<goodsarray.length;i++){ goods temp = goodsarray[i]; string name = temp.getname(); if (name.equals(placeholder)){ name = name + "[未上架]" ; } system.out.println( "\t" + temp.getid() + "\t" + temp.getname() + "\t" + temp.getprice()); } system.out.println( "=========================================" ); } } |
goods类
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class goods{ //商品编号 private int id;
//商品名称 private string name;
//商品价格 private double price;
public goods( int id,string name, double price){ this .id = id; this .name = name; this .price = price; } public int getid(){ return this .id; }
public int getindex(){ return this .getid()- 1 ; } public string getname(){ return this .name; }
public void setname(string name) { this .name = name; } public double getprice(){ return this .price; }
public void setprice( double price) { this .price = price; } @override public string tostring(){ return string.format( "[%2d] %s %.2f" , this .getid(), this .getname(), this .getprice()); } } |
order类
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class order{ private static int orderid = 0 ;
private int id;
private goods[] items;
private int [] itmesnumber;
private int currentindex;
public order(){ this .id = ++orderid; this .items = new goods[goodscenter.getmaxgoods()]; this .itmesnumber = new int [goodscenter.getmaxgoods()]; this .currentindex = - 1 ; }
public void add(goods goods, int count){ int index = goods.getindex(); this .items[index] = goods; this .itmesnumber[index] += count; }
public void cance(goods goods, int count){ int index = goods.getindex(); int value = this .itmesnumber[index]-count; if (value > 0 ){ this .itmesnumber[index] = value; } else { this .items[index] = null ; this .itmesnumber[index] = 0 ; } } public int getsize(){ return this .currentindex+ 1 ; }
public double gettotalprice(){ double tatalprivce = 0 ; for ( int i = 0 ;i< this .items.length;i++){ goods goods = this .items[i]; if (goods != null ){ tatalprivce += ( this .itmesnumber[goods.getindex()] * goods.getprice()); } } return tatalprivce; }
public int getid(){ return this .id; }
public void printorder(){ system.out.println( "========================" ); system.out.println( "编号" + this .getid() ); system.out.println( "打印时间" + localdate.now().tostring()); system.out.println( "========================" ); system.out.println( "编号 名称 数量 单价" ); for ( int i = 0 ;i< this .items.length;i++){ goods goods = this .items[i]; if (goods != null ){ int count = this .itmesnumber[goods.getindex()]; if (count <= 0 ){ continue ; } system.out.println(string.format( "%2d\t%s\t%d\t%.2f" ,goods.getid(),goods.getname(),count,goods.getprice() )); } } system.out.println( "=========================" ); system.out.println(string.format( "总价:%2f" , this .gettotalprice())); system.out.println( "=========================" ); } } |
项目总结
用常用string类,scanner类实现,代码量不多,简单易懂 有弊端存在,就是用数组存放商品,容易出现数组越界异常,而且如果商品多的话用数组存储也是极其不方便的 还有就是未使用到数据库,商品信息,订单信息的保存有很多不方便的地方,如果建立连接了数据库,这个问题就解决了目前能力只能实现到这了,希望可以再努力一下,将数据库加入到项目中,让它的易用性再提升更多。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
原文链接：https://blog.csdn.net/weixin_43224539/article/details/89855873
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