商品类
```
public class Article {
// 名字 单价 库存 已卖数量
public Stringname;
public double price;
public int amount;
public int number;
public void print(int index){
System.out.println(index +"\t" +name +"\t"+price+"\t"+amount+"\t"+number);
}
public void setArticle(String mingzi,double danjia,int kucun,int yishou){
name = mingzi;
price = danjia;
amount = kucun;
number = yishou;
}
}
```
商品集合（仓库）* 仓库进行管理商品
```
public class ArticleSet {
Article []articles =new Article[30];
}
```
菜单切换
```
public class ArticleManage {
ArticleSetarticleSet =new ArticleSet();
//仓库初始化，放入一些商品
public void initial(){
Article xiaomi11 =new Article();
/*
xiaomi11.name = "小米11";
xiaomi11.number = 30;
xiaomi11.amount = 0;
xiaomi11.price = 1999;*/
xiaomi11.setArticle("小米11",1030,0,0);
Article xiaomi11pro =new Article();
xiaomi11pro.setArticle("小米11pro",2999,10,0);
Article xiaomiUltra =new Article();
xiaomiUltra.setArticle("小米至尊版",3999,20,0);
articleSet.articles[0] = xiaomi11;
articleSet.articles[1] = xiaomi11pro;
articleSet.articles[2] = xiaomiUltra;
}
//启动菜单
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.商品销售排行榜");
System.out.println("6.退出");
System.out.println("***********************");
System.out.println("请输入功能编号:");
Scanner scanner =new Scanner(System.in);
int funNo = scanner.nextInt();
switch (funNo){
case 1:
System.out.println("1.查看商品信息");
chakan();
break;
case 2:
System.out.println("2.新增商品信息");
add();
break;
case 3:
System.out.println("3.删除商品信息");
delete();
break;
case 4:
System.out.println("4.卖出商品");
saleOut();
break;
case 5:
System.out.println("5.商品销售排行榜");
leadeBand();
break;
case 6:
System.out.println("谢谢，已经退出");
flag =false;
break;
default:
System.out.println("您输入的功能编号有误");
break;
}
}while(flag);
}
public void chakan(){
System.out.println("编号 \t 名字 \t 库存 \t 已售");
for(int i=0;i
if(articleSet.articles[i]!=null){
articleSet.articles[i].print(i);
}
}
}
private void add() {
Scanner scanner =new Scanner(System.in);
System.out.println("请输入商品名称:");
String name = scanner.next();
System.out.println("请输入单价:");
double price = scanner.nextDouble();
System.out.println("请输入库存:");
int count = scanner.nextInt();
System.out.println("请输入已卖的数量:");
int number = scanner.nextInt();
Article newArticle =new Article();
newArticle.setArticle(name,price,count,number);
for(int i=0;i
if(articleSet.articles[i] ==null){
articleSet.articles[i] = newArticle; //把新建的对象放在数组中的第一个空位置
break; //后续的空位置直接跳过
}
}
}
private void delete() {
System.out.println("请输入要删除的商品编号");
Scanner scanner =new Scanner(System.in);
int bianhao = scanner.nextInt();
boolean flag =true;
for(int i=0;i
if(articleSet.articles[i] !=null && (i+1)==bianhao){
int j = i;
//后面元素向前移动
while(articleSet.articles[j+1] !=null){
articleSet.articles[j] =articleSet.articles[j+1];
j++;
}
articleSet.articles[j] =null;
flag =true;
break; //后续的空数组元素没有必要执行
}else{
flag =false;
}
}
if(flag){
System.out.println("删除成功");
}else{
System.out.println("删除失败");
}
}
private void saleOut() {//卖出商品
System.out.println("请输入你要卖出的商品");
Scanner scanner =new Scanner(System.in);
String name = scanner.next();
for (int i=0;i
if ((articleSet.articles[i].name).equals(name)){
System.out.println("请输入你要售出的数量");
int shoumai = scanner.nextInt();
if (shoumai
articleSet.articles[i].number=articleSet.articles[i].number+shoumai;//已卖数量
articleSet.articles[i].amount=articleSet.articles[i].amount-shoumai;//库存
}else{
System.out.println("商品数量不足");
}
System.out.println("售卖成功");
break;
}
}
}
private void leadeBand() {
for(int i=0;i
for(int j =0;j
if (articleSet.articles[j] !=null &&articleSet.articles[j+i] !=null){
if (articleSet.articles[j].number
Article tempArticle =articleSet.articles[j];
articleSet.articles[j] =articleSet.articles[j+i];
articleSet.articles[j+1] = tempArticle;
}
}
}
}
}
```
测试类
```
public class demo {
public static void main(String[] args) {
ArticleManage articleManage =new ArticleManage();
articleManage.initial();
articleManage.startMenu();
}
}
```
