Java里如何开发简易财务统计报表_财务统计报表项目实战解析

public class FinancialRecord {
    private String category;     // 类别，如“工资”、“餐饮”
    private double amount;       // 金额，正数表示收入，负数表示支出
    private String date;         // 日期，格式如 "2024-05-10"
<pre class='brush:java;toolbar:false;'>public FinancialRecord(String category, double amount, String date) {
    this.category = category;
    this.amount = amount;
    this.date = date;
}

// Getter方法
public String getCategory() { return category; }
public double getAmount() { return amount; }
public String getDate() { return date; }

List<FinancialRecord> records = new ArrayList<>();
records.add(new FinancialRecord("工资", 8000, "2024-05-01"));
records.add(new FinancialRecord("餐饮", -300, "2024-05-02"));
records.add(new FinancialRecord("交通", -150, "2024-05-03"));
records.add(new FinancialRecord("兼职", 2000, "2024-05-05"));

public class FinancialReport {
<pre class='brush:java;toolbar:false;'>public static void generateReport(List<FinancialRecord> records) {
    double totalIncome = 0;
    double totalExpense = 0;
    Map<String, Double> categorySummary = new HashMap<>();

    for (FinancialRecord record : records) {
        if (record.getAmount() > 0) {
            totalIncome += record.getAmount();
        } else {
            totalExpense -= record.getAmount(); // 转为正数便于显示
        }

        // 按类别汇总
        categorySummary.put(record.getCategory(),
            categorySummary.getOrDefault(record.getCategory(), 0.0) + record.getAmount());
    }

    double netProfit = totalIncome - totalExpense;

    // 输出报表
    System.out.println("\n=== 财务统计报表 ===");
    System.out.printf("总收入: %.2f 元\n", totalIncome);
    System.out.printf("总支出: %.2f 元\n", totalExpense);
    System.out.printf("净收益: %.2f 元\n", netProfit);
    System.out.println("\n--- 分类明细 ---");
    categorySummary.forEach((cat, amt) ->
        System.out.printf("%s: %+.2f 元\n", cat, amt)
    );
}

public static List<FinancialRecord> filterByMonth(
    List<FinancialRecord> records, String yearMonth) {
    // yearMonth 格式为 "2024-05"
    return records.stream()
        .filter(r -> r.getDate().startsWith(yearMonth))
        .collect(Collectors.toList());
}

List<FinancialRecord> mayData = filterByMonth(records, "2024-05");
FinancialReport.generateReport(mayData);