用java写金额按周月季年分摊的代码，并显示每段的值

很高兴回答您的问题。以下是用 Java 编写金额按周月季年分摊的代码，并显示每段的值的示例代码：

import java.math.BigDecimal;
import java.math.RoundingMode;
import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;

public class AmountAllocation {
    public static void main(String[] args) {
        BigDecimal amount = new BigDecimal("10000"); // 总金额
        LocalDate startDate = LocalDate.now(); // 开始日期
        LocalDate endDate = startDate.plusYears(1); // 结束日期

        // 按周分摊
        BigDecimal weeklyAmount = amount.divide(new BigDecimal("52"), 2, RoundingMode.HALF_UP);
        LocalDate weekStartDate = startDate;
        while (weekStartDate.isBefore(endDate)) {
            LocalDate weekEndDate = weekStartDate.plusDays(6);
            if (weekEndDate.isAfter(endDate)) {
                weekEndDate = endDate;
            }
            System.out.println("第 " + weekStartDate.get(IsoFields.WEEK_OF_WEEK_BASED_YEAR) + " 周：" + weeklyAmount);
            weekStartDate = weekEndDate.plusDays(1);
        }

        // 按月分摊
        BigDecimal monthlyAmount = amount.divide(new BigDecimal("12"), 2, RoundingMode.HALF_UP);
        LocalDate monthStartDate = startDate.with(TemporalAdjusters.firstDayOfMonth());
        while (monthStartDate.isBefore(endDate)) {
            LocalDate monthEndDate = monthStartDate.with(TemporalAdjusters.lastDayOfMonth());
            if (monthEndDate.isAfter(endDate)) {
                monthEndDate = endDate;
            }
            System.out.println(monthStartDate.getMonth() + "：" + monthlyAmount);
            monthStartDate = monthEndDate.plusDays(1);
        }

        // 按季度分摊
        BigDecimal quarterlyAmount = amount.divide(new BigDecimal("4"), 2, RoundingMode.HALF_UP);
        LocalDate quarterStartDate = startDate.with(TemporalAdjusters.firstDayOfQuarter());
        while (quarterStartDate.isBefore(endDate)) {
            LocalDate quarterEndDate = quarterStartDate.with(TemporalAdjusters.lastDayOfQuarter());
            if (quarterEndDate.isAfter(endDate)) {
                quarterEndDate = endDate;
            }
            System.out.println("第 " + quarterStartDate.get(IsoFields.QUARTER_OF_YEAR) + " 季度：" + quarterlyAmount);
            quarterStartDate = quarterEndDate.plusDays(1);
        }

        // 按年分摊
        System.out.println("全年：" + amount);
    }
}

希望这个示例代码能够帮助您解决问题。