Java基于字符界面的简易收银台

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

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.com ');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

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

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

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('%2dt%st%dt%.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。

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