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@ -10,10 +10,154 @@ import java.util.Map;
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* @date 2023/1/15 20:49
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*/
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public class AverageCapitalUtils {
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// /**
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// * 等额本息计算获取还款方式为等额本息的每月偿还本金和利息
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// *
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// * 公式:每月偿还本息=〔贷款本金×月利率×(1+月利率)^还款月数〕÷〔(1+月利率)^还款月数-1〕
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// *
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// * @param invest
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// * 总借款额(贷款本金)
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// * @param yearRate
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// * 年利率
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// * @param month
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// * 还款总月数
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// * @return 每月偿还本金和利息,不四舍五入,直接截取小数点最后两位
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// */
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// public static BigDecimal getPerMonthPrincipalInterest(double invest, double yearRate, int totalmonth) {
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// double monthRate = yearRate / 12;
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// BigDecimal monthIncome = new BigDecimal(invest)
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// .multiply(new BigDecimal(monthRate * Math.pow(1 + monthRate, totalmonth)))
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// .divide(new BigDecimal(Math.pow(1 + monthRate, totalmonth) - 1), 2, BigDecimal.ROUND_UP);
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// //return monthIncome.doubleValue();
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// return monthIncome;
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// }
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//
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// /**
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// * 等额本息计算获取还款方式为等额本息的每月偿还利息
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// *
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// * 公式:每月偿还利息=贷款本金×月利率×〔(1+月利率)^还款月数-(1+月利率)^(还款月序号-1)〕÷〔(1+月利率)^还款月数-1〕
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// *
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// * @param invest
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// * 总借款额(贷款本金)
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// * @param yearRate
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// * 年利率
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// * @param month
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// * 还款总月数
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// * @return 每月偿还利息
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// */
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// public static Map<Integer, BigDecimal> getPerMonthInterest(double invest, double yearRate, int totalmonth) {
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// Map<Integer, BigDecimal> map = new HashMap<Integer, BigDecimal>();
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// double monthRate = yearRate / 12;
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// BigDecimal monthInterest;
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// for (int i = 1; i < totalmonth + 1; i++) {
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// BigDecimal multiply = new BigDecimal(invest).multiply(new BigDecimal(monthRate));
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// BigDecimal sub = new BigDecimal(Math.pow(1 + monthRate, totalmonth))
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// .subtract(new BigDecimal(Math.pow(1 + monthRate, i - 1)));
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// monthInterest = multiply.multiply(sub).divide(new BigDecimal(Math.pow(1 + monthRate, totalmonth) - 1), 2,
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// BigDecimal.ROUND_DOWN);
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// monthInterest = monthInterest.setScale(2, BigDecimal.ROUND_DOWN);
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// map.put(i, monthInterest);
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// }
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// return map;
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// }
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//
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// /**
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// * 等额本息计算获取还款方式为等额本息的每月偿还本金
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// *
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// * @param invest
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// * 总借款额(贷款本金)
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// * @param yearRate
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// * 年利率
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// * @param month
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// * 还款总月数
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// * @return 每月偿还本金
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// */
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// public static Map<Integer, BigDecimal> getPerMonthPrincipal(double invest, double yearRate, int totalmonth) {
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// double monthRate = yearRate / 12;
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// BigDecimal monthIncome = new BigDecimal(invest)
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// .multiply(new BigDecimal(monthRate * Math.pow(1 + monthRate, totalmonth)))
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// .divide(new BigDecimal(Math.pow(1 + monthRate, totalmonth) - 1), 2, BigDecimal.ROUND_DOWN);
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// Map<Integer, BigDecimal> mapInterest = getPerMonthInterest(invest, yearRate, totalmonth);
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// Map<Integer, BigDecimal> mapPrincipal = new HashMap<Integer, BigDecimal>();
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//
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// for (Map.Entry<Integer, BigDecimal> entry : mapInterest.entrySet()) {
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// mapPrincipal.put(entry.getKey(), monthIncome.subtract(entry.getValue()));
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// }
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// return mapPrincipal;
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// }
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//
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// /**
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// * 等额本息计算获取还款方式为等额本息的总利息
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// *
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// * @param invest
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// * 总借款额(贷款本金)
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// * @param yearRate
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// * 年利率
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// * @param month
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// * 还款总月数
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// * @return 总利息
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// */
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// public static double getInterestCount(double invest, double yearRate, int totalmonth) {
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// BigDecimal count = new BigDecimal(0);
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// Map<Integer, BigDecimal> mapInterest = getPerMonthInterest(invest, yearRate, totalmonth);
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//
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// for (Map.Entry<Integer, BigDecimal> entry : mapInterest.entrySet()) {
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// count = count.add(entry.getValue());
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// }
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// return count.doubleValue();
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// }
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//
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// /**
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// * 应还本金总和
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// *
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// * @param invest
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// * 总借款额(贷款本金)
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// * @param yearRate
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// * 年利率
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// * @param month
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// * 还款总月数
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// * @return 应还本金总和
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// */
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// public static double getPrincipalInterestCount(double invest, double yearRate, int totalmonth) {
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// double monthRate = yearRate / 12;
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// BigDecimal perMonthInterest = new BigDecimal(invest)
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// .multiply(new BigDecimal(monthRate * Math.pow(1 + monthRate, totalmonth)))
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// .divide(new BigDecimal(Math.pow(1 + monthRate, totalmonth) - 1), 2, BigDecimal.ROUND_DOWN);
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// BigDecimal count = perMonthInterest.multiply(new BigDecimal(totalmonth));
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// count = count.setScale(2, BigDecimal.ROUND_DOWN);
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// return count.doubleValue();
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// }
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//
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// /**
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// * @param args
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// */
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// public static void main(String[] args) {
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// double invest = 38988; // 本金
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// int month = 12;
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// double yearRate = 0.15; // 年利率
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// BigDecimal perMonthPrincipalInterest = getPerMonthPrincipalInterest(invest, yearRate, month);
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// System.out.println("等额本息---每月还款本息:" + perMonthPrincipalInterest);
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// System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 3));
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// System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 6));
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// System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 9));
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// System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 12));
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// System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 15));
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// System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 18));
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// /*Map<Integer, BigDecimal> mapInterest = getPerMonthInterest(invest, yearRate, month);
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// System.out.println("等额本息---每月还款利息:" + mapInterest);
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// Map<Integer, BigDecimal> mapPrincipal = getPerMonthPrincipal(invest, yearRate, month);
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// System.out.println("等额本息---每月还款本金:" + mapPrincipal);
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// double count = getInterestCount(invest, yearRate, month);
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// System.out.println("等额本息---总利息:" + count);
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// double principalInterestCount = getPrincipalInterestCount(invest, yearRate, month);
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// System.out.println("等额本息---应还本息总和:" + principalInterestCount);*/
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// }
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/**
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* 等额本息计算获取还款方式为等额本息的每月偿还本金和利息
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* 等额本金计算获取还款方式为等额本金的每月偿还本金和利息
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*
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* 公式:每月偿还本息=〔贷款本金×月利率×(1+月利率)^还款月数〕÷〔(1+月利率)^还款月数-1〕
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* 公式:每月偿还本金=(贷款本金÷还款月数)+(贷款本金-已归还本金累计额)×月利率
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*
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* @param invest
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* 总借款额(贷款本金)
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@ -23,19 +167,25 @@ public class AverageCapitalUtils {
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* 还款总月数
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* @return 每月偿还本金和利息,不四舍五入,直接截取小数点最后两位
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*/
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public static BigDecimal getPerMonthPrincipalInterest(double invest, double yearRate, int totalmonth) {
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public static Map<Integer, Double> getPerMonthPrincipalInterest(double invest, double yearRate, int totalMonth) {
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Map<Integer, Double> map = new HashMap<Integer, Double>();
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// 每月本金
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double monthPri = getPerMonthPrincipal(invest, totalMonth);
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// 获取月利率
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double monthRate = yearRate / 12;
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BigDecimal monthIncome = new BigDecimal(invest)
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.multiply(new BigDecimal(monthRate * Math.pow(1 + monthRate, totalmonth)))
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.divide(new BigDecimal(Math.pow(1 + monthRate, totalmonth) - 1), 2, BigDecimal.ROUND_UP);
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//return monthIncome.doubleValue();
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return monthIncome;
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monthRate = new BigDecimal(monthRate).setScale(6, BigDecimal.ROUND_DOWN).doubleValue();
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for (int i = 1; i <= totalMonth; i++) {
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double monthRes = monthPri + (invest - monthPri * (i - 1)) * monthRate;
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monthRes = new BigDecimal(monthRes).setScale(2, BigDecimal.ROUND_DOWN).doubleValue();
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map.put(i, monthRes);
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}
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return map;
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}
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/**
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* 等额本息计算获取还款方式为等额本息的每月偿还利息
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* 等额本金计算获取还款方式为等额本金的每月偿还利息
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*
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* 公式:每月偿还利息=贷款本金×月利率×〔(1+月利率)^还款月数-(1+月利率)^(还款月序号-1)〕÷〔(1+月利率)^还款月数-1〕
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* 公式:每月应还利息=剩余本金×月利率=(贷款本金-已归还本金累计额)×月利率
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*
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* @param invest
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* 总借款额(贷款本金)
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@ -45,24 +195,24 @@ public class AverageCapitalUtils {
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* 还款总月数
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* @return 每月偿还利息
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*/
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public static Map<Integer, BigDecimal> getPerMonthInterest(double invest, double yearRate, int totalmonth) {
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Map<Integer, BigDecimal> map = new HashMap<Integer, BigDecimal>();
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double monthRate = yearRate / 12;
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BigDecimal monthInterest;
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for (int i = 1; i < totalmonth + 1; i++) {
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BigDecimal multiply = new BigDecimal(invest).multiply(new BigDecimal(monthRate));
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BigDecimal sub = new BigDecimal(Math.pow(1 + monthRate, totalmonth))
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.subtract(new BigDecimal(Math.pow(1 + monthRate, i - 1)));
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monthInterest = multiply.multiply(sub).divide(new BigDecimal(Math.pow(1 + monthRate, totalmonth) - 1), 2,
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BigDecimal.ROUND_DOWN);
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monthInterest = monthInterest.setScale(2, BigDecimal.ROUND_DOWN);
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map.put(i, monthInterest);
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public static Map<Integer, Double> getPerMonthInterest(double invest, double yearRate, int totalMonth) {
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Map<Integer, Double> inMap = new HashMap<Integer, Double>();
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double principal = getPerMonthPrincipal(invest, totalMonth);
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Map<Integer, Double> map = getPerMonthPrincipalInterest(invest, yearRate, totalMonth);
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for (Map.Entry<Integer, Double> entry : map.entrySet()) {
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BigDecimal principalBigDecimal = new BigDecimal(principal);
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BigDecimal principalInterestBigDecimal = new BigDecimal(entry.getValue());
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BigDecimal interestBigDecimal = principalInterestBigDecimal.subtract(principalBigDecimal);
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interestBigDecimal = interestBigDecimal.setScale(2, BigDecimal.ROUND_DOWN);
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inMap.put(entry.getKey(), interestBigDecimal.doubleValue());
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}
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return map;
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return inMap;
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}
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/**
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* 等额本息计算获取还款方式为等额本息的每月偿还本金
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* 等额本金计算获取还款方式为等额本金的每月偿还本金
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*
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* 公式:每月应还本金=贷款本金÷还款月数
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*
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* @param invest
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* 总借款额(贷款本金)
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@ -72,22 +222,13 @@ public class AverageCapitalUtils {
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* 还款总月数
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* @return 每月偿还本金
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*/
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public static Map<Integer, BigDecimal> getPerMonthPrincipal(double invest, double yearRate, int totalmonth) {
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double monthRate = yearRate / 12;
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BigDecimal monthIncome = new BigDecimal(invest)
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.multiply(new BigDecimal(monthRate * Math.pow(1 + monthRate, totalmonth)))
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.divide(new BigDecimal(Math.pow(1 + monthRate, totalmonth) - 1), 2, BigDecimal.ROUND_DOWN);
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Map<Integer, BigDecimal> mapInterest = getPerMonthInterest(invest, yearRate, totalmonth);
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Map<Integer, BigDecimal> mapPrincipal = new HashMap<Integer, BigDecimal>();
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for (Map.Entry<Integer, BigDecimal> entry : mapInterest.entrySet()) {
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mapPrincipal.put(entry.getKey(), monthIncome.subtract(entry.getValue()));
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}
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return mapPrincipal;
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public static double getPerMonthPrincipal(double invest, int totalMonth) {
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BigDecimal monthIncome = new BigDecimal(invest).divide(new BigDecimal(totalMonth), 2, BigDecimal.ROUND_DOWN);
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return monthIncome.doubleValue();
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}
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/**
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* 等额本息计算获取还款方式为等额本息的总利息
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* 等额本金计算获取还款方式为等额本金的总利息
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*
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* @param invest
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* 总借款额(贷款本金)
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@ -97,27 +238,16 @@ public class AverageCapitalUtils {
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* 还款总月数
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* @return 总利息
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*/
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public static double getInterestCount(double invest, double yearRate, int totalmonth) {
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public static double getInterestCount(double invest, double yearRate, int totalMonth) {
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BigDecimal count = new BigDecimal(0);
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Map<Integer, BigDecimal> mapInterest = getPerMonthInterest(invest, yearRate, totalmonth);
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Map<Integer, Double> mapInterest = getPerMonthInterest(invest, yearRate, totalMonth);
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for (Map.Entry<Integer, BigDecimal> entry : mapInterest.entrySet()) {
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count = count.add(entry.getValue());
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for (Map.Entry<Integer, Double> entry : mapInterest.entrySet()) {
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count = count.add(new BigDecimal(entry.getValue()));
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}
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return count.doubleValue();
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}
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/**
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* 应还本金总和
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*
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* @param invest
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* 总借款额(贷款本金)
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* @param yearRate
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* 年利率
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* @param month
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* 还款总月数
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* @return 应还本金总和
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*/
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public static double getPrincipalInterestCount(double invest, double yearRate, int totalmonth) {
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double monthRate = yearRate / 12;
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BigDecimal perMonthInterest = new BigDecimal(invest)
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@ -128,28 +258,22 @@ public class AverageCapitalUtils {
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return count.doubleValue();
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}
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/**
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* @param args
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*/
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public static void main(String[] args) {
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double invest = 38988; // 本金
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int month = 12;
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double yearRate = 0.15; // 年利率
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BigDecimal perMonthPrincipalInterest = getPerMonthPrincipalInterest(invest, yearRate, month);
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System.out.println("等额本息---每月还款本息:" + perMonthPrincipalInterest);
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System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 3));
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System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 6));
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System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 9));
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System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 12));
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System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 15));
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System.out.println("等额本息---每月还款本息:" + getPerMonthPrincipalInterest(invest, yearRate, 18));
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/*Map<Integer, BigDecimal> mapInterest = getPerMonthInterest(invest, yearRate, month);
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System.out.println("等额本息---每月还款利息:" + mapInterest);
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Map<Integer, BigDecimal> mapPrincipal = getPerMonthPrincipal(invest, yearRate, month);
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System.out.println("等额本息---每月还款本金:" + mapPrincipal);
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double count = getInterestCount(invest, yearRate, month);
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System.out.println("等额本息---总利息:" + count);
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double principalInterestCount = getPrincipalInterestCount(invest, yearRate, month);
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System.out.println("等额本息---应还本息总和:" + principalInterestCount);*/
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/**
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* @param args
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*/
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public static void main() {
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double invest = 10000; // 本金
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int month = 12;
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double yearRate = 0.015; // 年利率
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Map<Integer, Double> getPerMonthPrincipalInterest = getPerMonthPrincipalInterest(invest, yearRate, month);
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System.out.println("等额本金---每月本息:" + getPerMonthPrincipalInterest);
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double benjin = getPerMonthPrincipal(invest, month);
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System.out.println("等额本金---每月本金:" + benjin);
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Map<Integer, Double> mapInterest = getPerMonthInterest(invest, yearRate, month);
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System.out.println("等额本金---每月利息:" + mapInterest);
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double count = getInterestCount(invest, yearRate, month);
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System.out.println("等额本金---总利息:" + count);
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double principalInterestCount = getPrincipalInterestCount(invest, yearRate, month);
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System.out.println("等额本金---应还本息总和:"+principalInterestCount);
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}
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}
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}
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