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.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();
}
}
}
}
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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("=========================================");
}
}
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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());
}
}
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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("=========================");
}
}
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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服务器之家。
原文链接：https://blog.csdn.net/weixin_43224539/article/details/89855873