Java开发简易账单系统教程

public class Bill {
    private int id;
    private String title;
    private double amount;
    private String type; // "收入" 或 "支出"
    private String date;

    public Bill(int id, String title, double amount, String type, String date) {
        this.id = id;
        this.title = title;
        this.amount = amount;
        this.type = type;
        this.date = date;
    }

    // Getter 和 Setter 方法
    public int getId() { return id; }
    public void setId(int id) { this.id = id; }

    public String getTitle() { return title; }
    public void setTitle(String title) { this.title = title; }

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

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

    public String getDate() { return date; }
    public void setDate(String date) { this.date = date; }

    @Override
    public String toString() {
        return "ID: " + id + ", 标题: " + title + ", 金额: " + amount +
               ", 类型: " + type + ", 日期: " + date;
    }
}

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

public class BillManager {
    private List bills;
    private int nextId;
    private Scanner scanner;

    public BillManager() {
        bills = new ArrayList();
        nextId = 1;
        scanner = new Scanner(System.in);
    }

    // 添加账单
    public void addBill() {
        System.out.print("请输入账单标题: ");
        String title = scanner.nextLine();
        System.out.print("请输入金额: ");
        double amount = Double.parseDouble(scanner.nextLine());
        System.out.print("请输入类型 (收入/支出): ");
        String type = scanner.nextLine();
        System.out.print("请输入日期 (如 2025-04-05): ");
        String date = scanner.nextLine();

        Bill bill = new Bill(nextId++, title, amount, type, date);
        bills.add(bill);
        System.out.println("账单添加成功！");
    }

    // 查看所有账单
    public void listBills() {
        if (bills.isEmpty()) {
            System.out.println("暂无账单数据。");
            return;
        }
        for (Bill bill : bills) {
            System.out.println(bill);
        }
    }

    // 按ID删除账单
    public void deleteBill() {
        System.out.print("请输入要删除的账单ID: ");
        int id = Integer.parseInt(scanner.nextLine());
        boolean removed = bills.removeIf(bill -> bill.getId() == id);
        if (removed) {
            System.out.println("账单删除成功！");
        } else {
            System.out.println("未找到该ID的账单。");
        }
    }

    // 按关键字搜索账单（标题或类型）
    public void searchBill() {
        System.out.print("请输入搜索关键词（标题或类型）: ");
        String keyword = scanner.nextLine().toLowerCase();
        List results = new ArrayList();
        for (Bill bill : bills) {
            if (bill.getTitle().toLowerCase().contains(keyword) ||
                bill.getType().toLowerCase().contains(keyword)) {
                results.add(bill);
            }
        }
        if (results.isEmpty()) {
            System.out.println("未找到匹配的账单。");
        } else {
            for (Bill bill : results) {
                System.out.println(bill);
            }
        }
    }

    // 显示菜单
    public void showMenu() {
        while (true) {
            System.out.println("\n=== 简易账单管理系统 ===");
            System.out.println("1. 添加账单");
            System.out.println("2. 查看所有账单");
            System.out.println("3. 删除账单");
            System.out.println("4. 搜索账单");
            System.out.println("5. 退出");
            System.out.print("请选择操作: ");
            String choice = scanner.nextLine();

            switch (choice) {
                case "1":
                    addBill();
                    break;
                case "2":
                    listBills();
                    break;
                case "3":
                    deleteBill();
                    break;
                case "4":
                    searchBill();
                    break;
                case "5":
                    System.out.println("退出系统，再见！");
                    return;
                default:
                    System.out.println("无效选择，请重试。");
            }
        }
    }
}

public class Main {
    public static void main(String[] args) {
        BillManager manager = new BillManager();
        manager.showMenu();
    }
}