要求实现商品超市的商品维护模块。

要求实现商品超市的商品维护模块。商品维护模块主要包括：商品添加（输入商品编号、名称、价格、数量）、商品列表展示、商品入库（输入商品编号，然后提示用户输入入库数量，然后进行修改操作）、商品出库（输入商品编号，然后提示用户输入出库数量，然后进行修改操作）、修改商品价格（提示用户输入编号，然后输入新价格）。
采用Scanner提示用户进行输入，用System.out.println实现界面。
Scanner s=new Scanner(System.in);
s.nextInt();
有没有老哥知道这个要怎么写呀

public class Demo3Redo {
public static void main(String[] args) {
Map<String, Good> goodsMap = new HashMap<String, Good>() {
{
put("GOOD1", new Good("GOOD1", "商品1", 10.0, 30));
put("GOOD2", new Good("GOOD2", "商品2", 90.0, 20));
put("GOOD3", new Good("GOOD3", "商品3", 10.3, 11));
put("GOOD4", new Good("GOOD4", "商品4", 9.0, 10));

    }
};
Scanner sc = new Scanner(System.in);
while (true){
    System.out.println("请输入菜单编号:");
    System.out.println("1 商品展示:");
    System.out.println("2 商品入库:");
    System.out.println("3 商品出库:");
    System.out.println("4 价格修改:");
    System.out.println("5 退出:");
    String flag = sc.nextLine();
    switch (flag) {
        case "1":
            System.out.println("商品编号  商品名称  商品价格  商品库存");
            for (Map.Entry<String, Good> goodEntry : goodsMap.entrySet()) {
                Good good = goodEntry.getValue();
                System.out.println(good.getId() + "    " + good.getName() + "    " + good.getPrice() + "    " + good.getInventory());
            }
            break;
        case "2":
            System.out.println("请输入商品编号:");
            String id = sc.nextLine();
            Good good = goodsMap.get(id);
            System.out.println("请输入入库数量:");
            String count = sc.nextLine();
            good.setInventory(good.getInventory() + new Integer(count));
            break;
        case "3":
            System.out.println("请输入商品编号:");
            String idIncre = sc.nextLine();
            Good goodIncre = goodsMap.get(idIncre);
            System.out.println("请输入出库数量:");
            String incre = sc.nextLine();
            int i = goodIncre.getInventory() - new Integer(incre);
            if (i < 0) {
                i = 0;
            }
            goodIncre.setInventory(i);
            break;
        case "4":
            System.out.println("请输入商品编号:");
            String idPrice = sc.nextLine();
            Good goodPrice = goodsMap.get(idPrice);
            System.out.println("价格:");
            String price = sc.nextLine();
            goodPrice.setPrice(new Double(price));
            break;
        case  "5":
            System.exit(0);
    }
}

}
}

class Good {
private String id;
private String name;
private Double price;
private int inventory;

public Good(String id, String name, Double price, int inventory) {
this.id = id;
this.name = name;
this.price = price;
this.inventory = inventory;
}

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public Double getPrice() {
return price;
}

public void setPrice(Double price) {
this.price = price;
}

public int getInventory() {
return inventory;
}

public void setInventory(int inventory) {
this.inventory = inventory;
}
}

这是考察你对集合和对象的运用，可以创建商品，分类，仓库三个对象，分别定义好上面的属性，编写增删查改的方法，添加入库出库都是将商品放到集合里面，或者删除之类的操作

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入商品编号:");
        String shopNum = scanner.nextLine();
        System.out.println("请输入商品名称:");
        String shopName = scanner.nextLine();
        System.out.println("请输入商品价格:");
        String shopValue = scanner.nextLine();
        System.out.println("请输入商品数量:");
        String shopMany = scanner.nextLine();
        System.out.println("商品编号  |  商品名称  |  商品价格  |  商品数量");
        System.out.println(shopNum +"  |  "+ shopName+"  |  " + shopValue+"  |  " + shopMany);
        System.out.println("输入完毕");

    }