帮我用java编写一个药物系统

好的，药物系统可以包括以下功能：

1. 药品信息管理：包括药品名称、药品条形码、药品价格、药品类别、药品描述等信息的维护和管理。

2. 药品库存管理：包括药品入库、出库、库存查询等功能。

3. 药品销售管理：包括销售单据的生成、药品销售记录的维护、销售统计等功能。

4. 药品报警管理：包括对药品过期、库存不足等情况进行报警提示。

下面是一个简单的药物管理系统的Java代码：

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;

public class MedicineSystem {
    private List<Medicine> medicines = new ArrayList<Medicine>();
    private Scanner scanner = new Scanner(System.in);

    public void showMenu() {
        System.out.println("=========================");
        System.out.println("欢迎使用药物管理系统");
        System.out.println("1. 添加药品");
        System.out.println("2. 查询药品信息");
        System.out.println("3. 修改药品信息");
        System.out.println("4. 删除药品");
        System.out.println("5. 入库");
        System.out.println("6. 出库");
        System.out.println("7. 库存查询");
        System.out.println("8. 销售管理");
        System.out.println("9. 药品报警管理");
        System.out.println("0. 退出系统");
        System.out.println("=========================");
    }

    public void addMedicine() {
        Medicine medicine = new Medicine();
        System.out.println("请输入药品名称：");
        medicine.setName(scanner.next());
        System.out.println("请输入药品价格：");
        medicine.setPrice(scanner.nextDouble());
        System.out.println("请输入药品条形码：");
        medicine.setBarcode(scanner.next());
        System.out.println("请输入药品类别：");
        medicine.setType(scanner.next());
        System.out.println("请输入药品描述：");
        medicine.setDescription(scanner.next());
        medicines.add(medicine);
        System.out.println("药品添加成功！");
    }

    public void queryMedicine() {
        System.out.println("请输入要查询的药品名称：");
        String name = scanner.next();
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getName().equals(name)) {
                System.out.println("药品名称：" + medicine.getName());
                System.out.println("药品价格：" + medicine.getPrice());
                System.out.println("药品条形码：" + medicine.getBarcode());
                System.out.println("药品类别：" + medicine.getType());
                System.out.println("药品描述：" + medicine.getDescription());
                return;
            }
        }
        System.out.println("未找到该药品！");
    }

    public void updateMedicine() {
        System.out.println("请输入要修改的药品名称：");
        String name = scanner.next();
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getName().equals(name)) {
                System.out.println("请输入新的药品价格：");
                medicine.setPrice(scanner.nextDouble());
                System.out.println("请输入新的药品条形码：");
                medicine.setBarcode(scanner.next());
                System.out.println("请输入新的药品类别：");
                medicine.setType(scanner.next());
                System.out.println("请输入新的药品描述：");
                medicine.setDescription(scanner.next());
                System.out.println("药品信息修改成功！");
                return;
            }
        }
        System.out.println("未找到该药品！");
    }

    public void deleteMedicine() {
        System.out.println("请输入要删除的药品名称：");
        String name = scanner.next();
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getName().equals(name)) {
                it.remove();
                System.out.println("药品删除成功！");
                return;
            }
        }
        System.out.println("未找到该药品！");
    }

    public void addStock() {
        System.out.println("请输入要入库的药品名称：");
        String name = scanner.next();
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getName().equals(name)) {
                System.out.println("请输入入库数量：");
                int count = scanner.nextInt();
                medicine.setStock(medicine.getStock() + count);
                System.out.println("药品入库成功！");
                return;
            }
        }
        System.out.println("未找到该药品！");
    }

    public void reduceStock() {
        System.out.println("请输入要出库的药品名称：");
        String name = scanner.next();
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getName().equals(name)) {
                System.out.println("请输入出库数量：");
                int count = scanner.nextInt();
                if (count > medicine.getStock()) {
                    System.out.println("库存不足！");
                    return;
                }
                medicine.setStock(medicine.getStock() - count);
                System.out.println("药品出库成功！");
                return;
            }
        }
        System.out.println("未找到该药品！");
    }

    public void queryStock() {
        System.out.println("请输入要查询的药品名称：");
        String name = scanner.next();
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getName().equals(name)) {
                System.out.println("药品名称：" + medicine.getName());
                System.out.println("药品库存：" + medicine.getStock());
                return;
            }
        }
        System.out.println("未找到该药品！");
    }

    public void saleMedicine() {
        System.out.println("请输入销售药品名称：");
        String name = scanner.next();
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getName().equals(name)) {
                System.out.println("请输入销售数量：");
                int count = scanner.nextInt();
                if (count > medicine.getStock()) {
                    System.out.println("库存不足！");
                    return;
                }
                SaleRecord record = new SaleRecord();
                record.setMedicine(medicine);
                record.setCount(count);
                record.setAmount(medicine.getPrice() * count);
                medicine.setStock(medicine.getStock() - count);
                System.out.println("销售成功！");
                return;
            }
        }
        System.out.println("未找到该药品！");
    }

    public void alarmMedicine() {
        Iterator<Medicine> it = medicines.iterator();
        while (it.hasNext()) {
            Medicine medicine = it.next();
            if (medicine.getStock() < 10) {
                System.out.println("药品：" + medicine.getName() + " 库存不足！");
            }
            if (medicine.getExpireDate() != null && medicine.getExpireDate().getTime() < System.currentTimeMillis()) {
                System.out.println("药品：" + medicine.getName() + " 已过期！");
            }
        }
    }

    public void start() {
        while (true) {
            showMenu();
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    addMedicine();
                    break;
                case 2:
                    queryMedicine();
                    break;
                case 3:
                    updateMedicine();
                    break;
                case 4:
                    deleteMedicine();
                    break;
                case 5:
                    addStock();
                    break;
                case 6:
                    reduceStock();
                    break;
                case 7:
                    queryStock();
                    break;
                case 8:
                    saleMedicine();
                    break;
                case 9:
                    alarmMedicine();
                    break;
                case 0:
                    System.exit(0);
                default:
                    System.out.println("输入有误，请重新输入！");
            }
        }
    }

    public static void main(String[] args) {
        MedicineSystem system = new MedicineSystem();
        system.start();
    }
}

class Medicine {
    private String name;
    private double price;
    private String barcode;
    private String type;
    private String description;
    private int stock;
    private long expireDate;

    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 String getBarcode() {
        return barcode;
    }

    public void setBarcode(String barcode) {
        this.barcode = barcode;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }

    public long getExpireDate() {
        return expireDate;
    }

    public void setExpireDate(long expireDate) {
        this.expireDate = expireDate;
    }
}

class SaleRecord {
    private Medicine medicine;
    private int count;
    private double amount;

    public Medicine getMedicine() {
        return medicine;
    }

    public void setMedicine(Medicine medicine) {
        this.medicine = medicine;
    }

    public int getCount() {
        return count;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public double getAmount() {
        return amount;
    }

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

注意：以上代码仅提供参考，实际情况可能需要更多的功能或者具体的业务逻辑需要进行修改。