Java Monthly interest rate calculation (equal and principal loan)

Monthly repayment calculation formula of equal and principal interest:

Monthly principal and interest amount = (Principal x monthly rate X (1+ month rate) ^ repayment month) ÷ ((1+ monthly rate) ^ Repayment month-1))

Reverse Seeking Moon interest rate

The monthly rate is not calculated if it is reversed according to the above formula.

Here is a calculation of the specific test, starting from 1 to reduce the 0.1, reduced to 0.1 after each reduction, 0.01

/*** Project name:cfss_asws1 * File Name:NiTui.java * Package Name:test * date:2018 year August 16 afternoon 5:40:07 * Copyright (c) 2018 * Company: Shenzhen Ping An comprehensive financial Services Co., Ltd. All rights Reserved. *  */ PackageORG.AGONCAL.SAMPLE.JMH;/*** Classname:nitui <br/> * Function:todo add Function. <br/> * Reason:todo add Reason. <br/> * Dat E: August 16, 2018 PM 5:40:07 <br/> * *@authorZHANGZHEN626 *@version * @sinceJDK 1.6 *@see */ Public classNitui {/*** Rate: (here is a word describing the effect of this method). <br/> * TODO (described here to apply the condition – optional) .<br/> * TODO (here describes the execution process of this method – optional) .<br/> * TODO (this describes how this method is used – optional) .<br/> * TODO (this method is described here for considerations – optional) .<br/> * *@authorZHANGZHEN626 *@parama loan amount *@paramb Monthly Payment (monthly repayment amount) *@paramC Period of repayment *@paramCNT iterative test times *@paramINA is accurate to several decimal places. * @return     * @sinceJDK 1.6*/     Public Static DoubleRateDoubleADoubleBDoubleCintCntintINA) {        DoubleRate = 1, x, JD = 0.1, side = 0.1, I = 1;  Do{x= A/b-(Math.pow (1 + rate, c)-1)/(Math.pow (rate + 1, c) *Rate ); if(x * side > 0) {side= -side; JD*= 10; } Rate+ = Side/JD; }  while(i++ < CNT && Math.Abs (x) >= 1/math.pow (10, Ina));//if (i > CNT)//return Double.NaN;        returnRate ; }     Public Static voidMain (String agrs[]) {{//Double Present value = 7944760.00d; //Double annuity = 186627.21d; //Double number of periods = 48d; //calculated 200 times, less accurate than EXCEL20, error accurate to 10 digits after decimal pointSYSTEM.OUT.PRINTLN (Rate (150000, 6000, 36, 2111, 10)); }    }}

Java Monthly interest rate calculation (equal and principal loan)