Java控制台记账软件账目统计实现

public class Record {
    private String date;        // 记录日期，如 "2024-05-20"
    private String type;        // 类型："收入" 或 "支出"
    private double amount;      // 金额
    private String description; // 备注
public Record(String date, String type, double amount, String description) {
    this.date = date;
    this.type = type;
    this.amount = amount;
    this.description = description;
}

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

import java.util.ArrayList;
import java.util.List;
public class AccountBook {
private List records;
public AccountBook() {
    records = new ArrayList<>();
}

public void addRecord(Record record) {
    records.add(record);
}
}

public void showStatistics() {
    double totalIncome = 0;
    double totalExpense = 0;
for (Record record : records) {
    if ("收入".equals(record.getType())) {
        totalIncome += record.getAmount();
    } else if ("支出".equals(record.getType())) {
        totalExpense += record.getAmount();
    }
}

double balance = totalIncome - totalExpense;

System.out.println("=== 账目统计 ===");
System.out.printf("总收入: %.2f 元\n", totalIncome);
System.out.printf("总支出: %.2f 元\n", totalExpense);
System.out.printf("当前余额: %.2f 元\n", balance);
}

public void showMonthlyStatistics(String month) {
    // month 格式如 "2024-05"
    double income = 0, expense = 0;
for (Record record : records) {
    if (record.getDate().startsWith(month)) {
        if ("收入".equals(record.getType())) {
            income += record.getAmount();
        } else {
            expense += record.getAmount();
        }
    }
}

System.out.printf("=== %s 月统计 ===\n", month);
System.out.printf("收入: %.2f 元\n", income);
System.out.printf("支出: %.2f 元\n", expense);
System.out.printf("结余: %.2f 元\n", income - expense);
}

AccountBook book = new AccountBook();
book.addRecord(new Record("2024-05-01", "收入", 5000.0, "工资"));
book.addRecord(new Record("2024-05-03", "支出", 800.0, "房租"));
book.addRecord(new Record("2024-05-05", "支出", 200.0, "餐饮"));
book.showStatistics();           // 显示总体统计
book.showMonthlyStatistics("2024-05"); // 显示5月统计