Java基於字符界面的簡易收銀臺

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用Java實現簡易收銀臺，供大傢參考，具體內容如下

簡易收銀臺的實現並不難，主要實現這幾個類:

  • 商品類 Goods (將商品根據編號,名稱,價格存放)
  • 商品中心類 GoodsCenter (存放商品,可以添加商品,下架商品,修改商品信息,判斷商品是否存在或者貨架已滿,打印商品等功能)
  • 訂單類 Order (處理訂單,主要實現買單功能,下單,計算總價)

功能實現

初始化界面

商品上架  

修改商品信息

下架商品

 

返回並進入買單功能

 選擇商品及數量進行買單

取消訂單

 

查看訂單

 

返回並退出

功能分析

代碼展示

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("==============歡迎使用簡易收銀臺=============");
        System.out.println("    [U]使用   [S]設置  [A]關於  [Q]退出      ");
        System.out.println("          輸入 U  S  A  Q  進行操作          ");
        System.out.println("============================================");
    }
 
    public static void quit() {
        System.out.println("===========================================");
        System.out.println("                歡迎下次使用                ");
        System.out.println("===========================================");
        System.exit(0);
    }
 
    public static void usageInfo() {
        System.out.println("================買單功能====================");
        System.out.println(" [S]查看  [A]下單  [D]取消  [L]瀏覽   [R]返回");
        System.out.println("      輸入 S   A   D   L   R   進行操作     ");
        System.out.println("===========================================");
 
    }
 
    public static void about() {
        System.out.println("==================關於=====================");
        System.out.println("          名稱:簡易收銀臺                   ");
        System.out.println("          功能:基於字符界面的收銀臺操作       ");
        System.out.println("          作者:weiwei                      ");
        System.out.println("          版本:v0.0.1                      ");
        System.out.println("          意見反饋:[email protected]       ");
        System.out.println("==========================================");
 
 
    }
 
    public static void settingInfo() {
        System.out.println("=================設置功能==================");
        System.out.println(" [S]查看  [A]上架  [D]下架  [U]修改  [R]返回 ");
        System.out.println("     輸入  S    A   D  U   R 進行操作       ");
        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("請輸入下單信息[編號][數量] (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("請按照格式要求輸入信息");
                    break;
                }
                case "D":{
                    System.out.println("請輸入取消信息[編號 數量]（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("請按照格式要求輸入信息");
                    break;
                }
                case "L": {
                    GoodsCenter.printGoods();
                    break;
                }
                case "R": {
                    return;
                }
                default: {
                    usageInfo();
                }
            }
        }
 
    }
 
    
    public static void setting() {
        settingInfo();
        if (GoodsCenter.isFull()) {
            System.out.println("!當前商品貨架已經滿瞭，如果要進行添加請下降部分商品");
        }
        while (true) {
            String line = scanner.nextLine();
            switch (line.toUpperCase()) {
                case "S": {
                    GoodsCenter.printGoods();
                    break;
                }
                case "A": {
                    System.out.println("請輸入上架商品信息（如下格式：1 餐巾紙 1.4）:");
                    Goods goods = readGoods();
                    if (goods == null) {
                        System.out.println("!請按照格式要求輸入信息");
                        break;
                    }
                    if (GoodsCenter.isFull()) {
                        System.out.println("!當前商品貨架已經滿瞭，如果要進行添加請下降部分商品");
                    } else if (GoodsCenter.isExist(goods)) {
                        System.out.println("!上架商品已經存在，註意編號不能重復");
                    } else {
                        GoodsCenter.addGoods(goods);
                        GoodsCenter.printGoods();
                    }
                    break;
                }
                case "D": {
                    System.out.println("請輸入下架商品信息編號（如下格式：1 ）:");
                    Goods goods = readGoods();
                    if (goods == null) {
                        System.out.println("請按照格式要求輸入信息");
                        break;
                    }
                    if (GoodsCenter.isPutaway(goods)) {
                        GoodsCenter.soldOutGoods(goods);
                        GoodsCenter.printGoods();
                    } else {
                        System.out.println("請選擇上架的商品編號,當前下架商品未設置");
                    }
                    break;
                }
                case "U": {
                    System.out.println("請輸入修改商品信息（如下格式：1 餐巾紙 1.4 ）");
                    Goods goods = readGoods();
                    if (goods == null) {
                        System.out.println("請按照格式要求輸入信息");
                        break;
                    }
                    if (GoodsCenter.isPutaway(goods)) {
                        GoodsCenter.modifyGoods(goods);
                        GoodsCenter.printGoods();
                    } else {
                        System.out.println("請選擇上架的商品編號，當前修改商品未設置");
                    }
                    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類

class GoodsCenter {
    //商品占位符
    private static String placeholder = "--";
 
    //最大商品數量
    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;
    }
 
    //商品已滿
    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("=============商品清單================");
        System.out.println("\t" + "編號" + "\t" +"產品名稱" + "\t" + "單價");
        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類

class Goods{
    //商品編號
    private int id;
 
    //商品名稱
    private  String name;
 
    //商品價格
    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類

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("編號" + this.getId()     );
        System.out.println("打印時間" + LocalDate.now().toString());
        System.out.println("========================");
        System.out.println("編號   名稱    數量   單價");
        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("總價:%2f",this.getTotalPrice()));
        System.out.println("=========================");
    }
}

項目總結

  • 用常用String類,Scanner類實現,代碼量不多,簡單易懂
  • 有弊端存在,就是用數組存放商品,容易出現數組越界異常,而且如果商品多的話用數組存儲也是極其不方便的
  • 還有就是未使用到數據庫,商品信息,訂單信息的保存有很多不方便的地方,如果建立連接瞭數據庫,這個問題就解決瞭

目前能力隻能實現到這瞭,希望可以再努力一下,將數據庫加入到項目中,讓它的易用性再提升更多。

以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。

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