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("%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我们。