1: Article
package com.company;
public class Article {
public String name; // 商品的名称
public int amount ; // 库存
public double price; // 单价
public int number ; // 售出的数量
public void print( int index) { // 打印 : 为了便于查看商品类的详情
System.out.println(index + "\t" + name+"\t" + amount+"\t" + price+"\t"+number);
}
// 初始化商品信息
public void setArticle(String mingzi,int kucun,double danjia,int shouchu){
name = mingzi;
amount = kucun;
price = danjia;
number = shouchu;
}
}
2:ArticleManage
public class ArticleManage {
// 创建一个实体的仓库对象,并初始化
ArticleSet articleSet = new ArticleSet();
// 初始化仓库,放入起始商品
public void inital () {
Article xiaomi11 = new Article();
xiaomi11.setArticle("小米11",30,1999,0);
Article xiaomi11por = new Article();
xiaomi11por.setArticle("小米11por",40,2999,0);
Article xiaomuUltra = new Article();
xiaomuUltra.setArticle("小米增强版",50,3999,0);
articleSet.articles[0] = xiaomi11;
articleSet.articles[1] = xiaomi11por;
articleSet.articles[2] = xiaomuUltra;
}
public void startMenu () {
boolean flag = true;
do {
System.out.println("***************************");
System.out.println("1 查看商品信息");
System.out.println("2 新增商品信息");
System.out.println("3 删除商品信息");
System.out.println("4 卖出商品");
System.out.println("5 排行榜");
System.out.println("6 退出");
System.out.println("**************************");
System.out.println("请输入你要执行的功能编号:");
Scanner scanner = new Scanner(System.in);
int gongnengBianhao = scanner.nextInt();
switch (gongnengBianhao){
case 1:
System.out.println("查看商品");
chakan();
break;
case 2:
System.out.println("新增商品信息");
add();
break;
case 3:
System.out.println("删除商品信息");
delete();
break;
case 4:
System.out.println("卖出商品");
sell();
break;
case 5:
System.out.println("排行榜");
leaderboard();
break;
case 6:
System.out.println("感谢使用,已经退出");
flag = false;
break;
default:
System.out.println("你输入的功能编号有误");
break;
}
}while (flag);
}
// 排行榜
public void leaderboard(){
int count = 0; // 统计原始数组使用的长度
for (int i = 0; i < articleSet.articles.length; i++) {
if ( articleSet.articles[i] !=null){
count ++ ;
}
}
// 根据使用的长度临时新建一个数组,这个数组元素存储
Article[] newTemp = new Article[count];
// 把旧数组中的元素全部拷贝到新数组中,新数组装满元素
for (int i = 0; i < count; i++) {
newTemp[i] = articleSet.articles[i];
}
// 排序 (冒泡排序)
for (int i = 0; i < newTemp.length-1; i ++) { // 让所有元素参与排序
for (int j = 0; j < newTemp.length -i-1; j++) { // 让当前元素和它后面的元素对比
if ( newTemp[j+1] != null ){ // 保证下一个要对比元素存在
if ( newTemp[j] . number < newTemp[j+1].number ) {
// 两个元素交换位置,需要借助第三方临时变量做存储
Article temp = newTemp[j];
newTemp[j] = newTemp[j+1];
newTemp[j+1] = temp;
}
}
}
}
// 显示名次
System.out.println("名次: \t 销售数量 \t 商品名次");
for (int i = 0; i < newTemp.length; i++) {
System.out.println((i+1) + "\t" + newTemp[i].number + "\t" + newTemp[i].name);
}
}
public void sell(){
System.out.println("请输入你要卖出的商品的名字:");
Scanner scanner = new Scanner(System.in);
String name = scanner.next();
boolean flag = true;
for (int i = 0; i < articleSet.articles.length; i++) {
if ( articleSet.articles[i] != null && articleSet.articles[i].name.equals(name)){
System.out.println("请输入要卖出的数量:");
int maichu = scanner.nextInt();
if (maichu < articleSet.articles[i].amount){ // 卖出数量 < 库存数
// 新库存 = 旧库存 - 卖出数量
articleSet.articles[i].amount = articleSet.articles[i].amount - maichu;
// 新库存 = 旧库存 + 卖出数量
articleSet.articles[i].number = articleSet.articles[i].number + maichu;
flag = true;
}else{
flag = false;
System.out.println("库存不够了");
}
break; // 找到对应的位置,已经完成了修改,后续的元素直接跳过,中期循环
}else {
flag = false;
System.out.println("你要卖出的商品没找到");
}
}
if(flag == true) {
System.out.println("卖出成功");
}else{
System.out.println("卖出失败");
}
}
private void delete() {
System.out.println("输入你要删除的商品编号:");
Scanner scanner = new Scanner(System.in);
int delNo = scanner.nextInt();
boolean flap = true;
for (int i = 0; i < articleSet.articles.length; i++) {
if (delNo == (i + 1) && articleSet.articles[i] != null) {
int j = i; // 备份下标
if (articleSet.articles[j + 1] != null) {
articleSet.articles[j] = articleSet.articles[j + i];
j++;
articleSet.articles[j] = null;
flap = true;
} else {
flap = false;
}
break; // 操作完成,直接中断for循环 ,后续的null元素无需操作
} else {
flap = false;
System.out.println("hjbhj");
if (flap) {
System.out.println("删除成功");
} else {
System.out.println("删除失败!");
}
}
}
}
public void chakan(){
System.out.println("编号\t 名称 \t 库存 \t 单价 \t 售出数量");
for (int i = 0; i < articleSet.articles.length; i++) {
if (articleSet.articles[i]!= null ){
articleSet.articles[i].print(i);
}
}
}
public void add(){
Scanner scanner = new Scanner(System.in);
System.out.println("请输入商品的名字:");
String name = scanner.next();
System.out.println("价格:");
double price = scanner.nextDouble();
System.out.println("库存:");
int kucun = scanner.nextInt();
System.out.println("售出数量:");
int number = scanner.nextInt();
// 把接受到的数据封装到对象中
Article newArticle = new Article();
newArticle.setArticle(name , kucun , price ,number );
for (int i = 0; i < articleSet.articles.length; i++) {
if (articleSet.articles[i] == null ) { // 从前往后遍历数组,找到第一个没有元素
articleSet.articles[i] = newArticle; // 找到空位置,把新商品存入
break; // 只加入第一个位置,后续的位置不再判断
}
}
}
}
3:ArticleSet
public class ArticleSet {
Article[] articles = new Article[30];
}
4: Demo
public class Demo {
public static void main(String[] args) {
ArticleManage articleManage = new ArticleManage();
articleManage.inital();
articleManage.startMenu();
}
}