用java写一个仓库管理系统

好的，仓库管理系统可以包括以下功能：

1. 商品管理：添加、删除、修改商品信息。

2. 入库管理：记录商品入库信息，包括商品名称、数量、价格等信息。

3. 出库管理：记录商品出库信息，包括商品名称、数量、价格等信息。

4. 库存查询：查询商品当前库存数量及价格。

5. 统计报表：统计商品入库、出库、库存等信息，生成报表。

下面是一个简单的仓库管理系统的 Java 代码实现：

import java.util.ArrayList;
import java.util.Scanner;

public class WarehouseManagementSystem {

    static ArrayList<Commodity> commodities = new ArrayList<Commodity>();
    static ArrayList<InRecord> inRecords = new ArrayList<InRecord>();
    static ArrayList<OutRecord> outRecords = new ArrayList<OutRecord>();

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择操作：1.商品管理 2.入库管理 3.出库管理 4.库存查询 5.统计报表 6.退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    commodityManagement(scanner);
                    break;
                case 2:
                    inManagement(scanner);
                    break;
                case 3:
                    outManagement(scanner);
                    break;
                case 4:
                    queryInventory(scanner);
                    break;
                case 5:
                    statisticsReport();
                    break;
                case 6:
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }

    // 商品管理
    public static void commodityManagement(Scanner scanner) {
        while (true) {
            System.out.println("请选择操作：1.添加商品 2.删除商品 3.修改商品 4.返回上一级");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addCommodity(scanner);
                    break;
                case 2:
                    deleteCommodity(scanner);
                    break;
                case 3:
                    modifyCommodity(scanner);
                    break;
                case 4:
                    return;
                default:
                    System.out.println("输入有误，请重新输入！");
                    break;
            }
        }
    }

    // 添加商品
    public static void addCommodity(Scanner scanner) {
        System.out.println("请输入商品名称：");
        String name = scanner.next();
        System.out.println("请输入商品单价：");
        double price = scanner.nextDouble();
        System.out.println("请输入商品库存数量：");
        int amount = scanner.nextInt();
        Commodity commodity = new Commodity(name, price, amount);
        commodities.add(commodity);
        System.out.println("添加成功！");
    }

    // 删除商品
    public static void deleteCommodity(Scanner scanner) {
        System.out.println("请输入要删除的商品名称：");
        String name = scanner.next();
        for (int i = 0; i < commodities.size(); i++) {
            if (commodities.get(i).getName().equals(name)) {
                commodities.remove(i);
                System.out.println("删除成功！");
                return;
            }
        }
        System.out.println("未找到该商品！");
    }

    // 修改商品
    public static void modifyCommodity(Scanner scanner) {
        System.out.println("请输入要修改的商品名称：");
        String name = scanner.next();
        for (int i = 0; i < commodities.size(); i++) {
            if (commodities.get(i).getName().equals(name)) {
                System.out.println("请输入修改后的商品单价：");
                double price = scanner.nextDouble();
                System.out.println("请输入修改后的商品库存数量：");
                int amount = scanner.nextInt();
                commodities.get(i).setPrice(price);
                commodities.get(i).setAmount(amount);
                System.out.println("修改成功！");
                return;
            }
        }
        System.out.println("未找到该商品！");
    }

    // 入库管理
    public static void inManagement(Scanner scanner) {
        System.out.println("请输入入库商品名称：");
        String name = scanner.next();
        System.out.println("请输入入库数量：");
        int amount = scanner.nextInt();
        System.out.println("请输入入库单价：");
        double price = scanner.nextDouble();
        InRecord inRecord = new InRecord(name, amount, price);
        inRecords.add(inRecord);
        for (int i = 0; i < commodities.size(); i++) {
            if (commodities.get(i).getName().equals(name)) {
                commodities.get(i).setAmount(commodities.get(i).getAmount() + amount);
                return;
            }
        }
        Commodity commodity = new Commodity(name, price, amount);
        commodities.add(commodity);
    }

    // 出库管理
    public static void outManagement(Scanner scanner) {
        System.out.println("请输入出库商品名称：");
        String name = scanner.next();
        System.out.println("请输入出库数量：");
        int amount = scanner.nextInt();
        System.out.println("请输入出库单价：");
        double price = scanner.nextDouble();
        OutRecord outRecord = new OutRecord(name, amount, price);
        outRecords.add(outRecord);
        for (int i = 0; i < commodities.size(); i++) {
            if (commodities.get(i).getName().equals(name)) {
                if (commodities.get(i).getAmount() < amount) {
                    System.out.println("库存不足，无法出库！");
                    return;
                }
                commodities.get(i).setAmount(commodities.get(i).getAmount() - amount);
                return;
            }
        }
        System.out.println("未找到该商品！");
    }

    // 库存查询
    public static void queryInventory(Scanner scanner) {
        System.out.println("请输入要查询的商品名称：");
        String name = scanner.next();
        for (int i = 0; i < commodities.size(); i++) {
            if (commodities.get(i).getName().equals(name)) {
                System.out.println("商品名称：" + commodities.get(i).getName() + "，库存数量：" + commodities.get(i).getAmount() + "，单价：" + commodities.get(i).getPrice());
                return;
            }
        }
        System.out.println("未找到该商品！");
    }

    // 统计报表
    public static void statisticsReport() {
        double inTotal = 0, outTotal = 0, inventoryTotal = 0;
        System.out.println("商品名称\t入库数量\t入库单价\t入库总价\t出库数量\t出库单价\t出库总价\t库存数量\t库存总价");
        for (Commodity commodity : commodities) {
            int inAmount = 0, outAmount = 0;
            double inPrice = 0, outPrice = 0, inventoryPrice = 0;
            for (InRecord inRecord : inRecords) {
                if (inRecord.getName().equals(commodity.getName())) {
                    inAmount += inRecord.getAmount();
                    inPrice = inRecord.getPrice();
                }
            }
            for (OutRecord outRecord : outRecords) {
                if (outRecord.getName().equals(commodity.getName())) {
                    outAmount += outRecord.getAmount();
                    outPrice = outRecord.getPrice();
                }
            }
            inventoryPrice = commodity.getAmount() * commodity.getPrice();
            System.out.println(commodity.getName() + "\t" + inAmount + "\t" + inPrice + "\t" + inAmount * inPrice + "\t" + outAmount + "\t" + outPrice + "\t" + outAmount * outPrice + "\t" + commodity.getAmount() + "\t" + inventoryPrice);
            inTotal += inAmount * inPrice;
            outTotal += outAmount * outPrice;
            inventoryTotal += inventoryPrice;
        }
        System.out.println("入库总额：" + inTotal + "，出库总额：" + outTotal + "，库存总额：" + inventoryTotal);
    }

}

class Commodity {

    private String name;
    private double price;
    private int amount;

    public Commodity(String name, double price, int amount) {
        this.name = name;
        this.price = price;
        this.amount = amount;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

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

    public int getAmount() {
        return amount;
    }

    public void setAmount(int amount) {
        this.amount = amount;
    }

}

class InRecord {

    private String name;
    private int amount;
    private double price;

    public InRecord(String name, int amount, double price) {
        this.name = name;
        this.amount = amount;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public int getAmount() {
        return amount;
    }

    public double getPrice() {
        return price;
    }

}

class OutRecord {

    private String name;
    private int amount;
    private double price;

    public OutRecord(String name, int amount, double price) {
        this.name = name;
        this.amount = amount;
        this.price = price;
    }

    public String getName() {
        return name;
    }

    public int getAmount() {
        return amount;
    }

    public double getPrice() {
        return price;
    }

}

以上代码只是一个简单的示例，实际应用中可能需要根据具体需求进行更改和扩展。