Java里如何实现简易记账软件_记账软件开发项目实例解析

public class Bill {
    private String type;     // 收支类型，如“餐饮”、“工资”
    private double amount;   // 金额
    private String date;     // 日期
    private String remark;   // 备注
<pre class='brush:java;toolbar:false;'>public Bill(String type, double amount, String date, String remark) {
    this.type = type;
    this.amount = amount;
    this.date = date;
    this.remark = remark;
}

// getter方法（setter可根据需要添加）
public String getType() { return type; }
public double getAmount() { return amount; }
public String getDate() { return date; }
public String getRemark() { return remark; }

@Override
public String toString() {
    return "类型：" + type + " | 金额：" + amount +
           " | 日期：" + date + " | 备注：" + remark;
}

import java.util.*;
<p>public class BillManager {
private List<Bill> bills;
private final String FILE_PATH = "bills.txt";</p><pre class='brush:java;toolbar:false;'>public BillManager() {
    bills = new ArrayList<>();
    loadFromFile(); // 启动时加载数据
}

// 添加账单
public void addBill(Bill bill) {
    bills.add(bill);
    saveToFile();
}

// 显示所有账单
public void showAllBills() {
    if (bills.isEmpty()) {
        System.out.println("暂无账单记录。");
        return;
    }
    for (int i = 0; i < bills.size(); i++) {
        System.out.println((i+1) + ". " + bills.get(i));
    }
}

// 按类型查询
public void searchByType(String type) {
    List<Bill> result = new ArrayList<>();
    for (Bill b : bills) {
        if (b.getType().equals(type)) {
            result.add(b);
        }
    }
    if (result.isEmpty()) {
        System.out.println("未找到该类型的记录。");
    } else {
        System.out.println("【" + type + "】相关记录：");
        for (Bill b : result) {
            System.out.println(b);
        }
    }
}

// 统计收支情况
public void showSummary() {
    double income = 0, expense = 0;
    for (Bill b : bills) {
        if (b.getAmount() > 0) {
            income += b.getAmount();
        } else {
            expense += Math.abs(b.getAmount());
        }
    }
    System.out.println("总收入：" + income);
    System.out.println("总支出：" + expense);
    System.out.println("结余：" + (income - expense));
}

// 保存到文件（简单文本格式）
private void saveToFile() {
    try (java.io.PrintWriter out = new java.io.PrintWriter(new java.io.FileWriter(FILE_PATH))) {
        for (Bill b : bills) {
            out.println(b.getType() + "," + b.getAmount() + "," + b.getDate() + "," + b.getRemark());
        }
    } catch (Exception e) {
        System.out.println("保存失败：" + e.getMessage());
    }
}

// 从文件加载
private void loadFromFile() {
    java.io.File file = new java.io.File(FILE_PATH);
    if (!file.exists()) return;

    try (java.util.Scanner scanner = new java.util.Scanner(file)) {
        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            String[] parts = line.split(",");
            if (parts.length == 4) {
                String type = parts[0];
                double amount = Double.parseDouble(parts[1]);
                String date = parts[2];
                String remark = parts[3];
                bills.add(new Bill(type, amount, date, remark));
            }
        }
    } catch (Exception e) {
        System.out.println("读取数据失败：" + e.getMessage());
    }
}

import java.util.Scanner;
<p>public class Main {
public static void main(String[] args) {
BillManager manager = new BillManager();
Scanner input = new Scanner(System.in);
int choice;</p><pre class='brush:java;toolbar:false;'>    do {
        System.out.println("\n--- 简易记账系统 ---");
        System.out.println("1. 添加账单");
        System.out.println("2. 查看所有账单");
        System.out.println("3. 查询某类型记录");
        System.out.println("4. 查看收支统计");
        System.out.println("0. 退出");
        System.out.print("请选择操作：");

        choice = input.nextInt();
        input.nextLine(); // 消费换行符

        switch (choice) {
            case 1:
                System.out.print("类型："); String type = input.nextLine();
                System.out.print("金额（收入为正，支出为负）："); double amount = input.nextDouble();
                input.nextLine(); // 消费换行
                System.out.print("日期（如2025-04-05）："); String date = input.nextLine();
                System.out.print("备注："); String remark = input.nextLine();
                manager.addBill(new Bill(type, amount, date, remark));
                System.out.println("添加成功！");
                break;
            case 2:
                manager.showAllBills();
                break;
            case 3:
                System.out.print("请输入要查询的类型：");
                String queryType = input.nextLine();
                manager.searchByType(queryType);
                break;
            case 4:
                manager.showSummary();
                break;
            case 0:
                System.out.println("再见！");
                break;
            default:
                System.out.println("无效选择，请重试。");
        }
    } while (choice != 0);

    input.close();
}