java等额本息、等额本金计算 记录一下

public static void main(String[] args) {

        double invest = 280000;

        double yearRate = 0.0655;

        double monthRate = yearRate/12;

        int year = 15;

        int month = year * 12;

        // 每月本息金额  = (本金×月利率×(1＋月利率)＾还款月数)÷ ((1＋月利率)＾还款月数-1)

        double monthIncome = (invest* monthRate * Math.pow(1+monthRate,month))

/(Math.pow(1+monthRate,month)-1);

        System.out.println("每月本息金额 : "+ monthIncome);

        

// 每月本金 = 本金×月利率×(1+月利率)^(还款月序号-1)÷((1+月利率)^还款月数-1)

        double monthCapital = 0;

        for(inti=1;i<month+1;i++){

                monthCapital = (invest* monthRate * (Math.pow((1+monthRate),i-1)))

/(Math.pow(1+monthRate,month)-1);

                System.out.println("第"+ i + "月本金： "+ monthCapital);

        }

                

// 每月利息  = 剩余本金 x 贷款月利率

        double monthInterest = 0;

        double capital = invest;double sumAvg = 0;

        double tmpCapital = 0;

            for(inti=1;i<month+1;i++){

                    capital = capital - tmpCapital;

                    monthInterest = capital * monthRate;

                    tmpCapital = (invest* monthRate * (Math.pow((1+monthRate),i-1)))

/(Math.pow(1+monthRate,month)-1);

                    System.out.println("第"+ i + "月利息： "+ monthInterest);                

                    sumAvg += monthInterest

            }

System.out.println

("总利息： "+ sumAvg);DecimalFormat decimalFormat = new DecimalFormat("0.00");

System.out.println

("总利息输出两位小数： "+ Double.parseDouble(decimalFormat.format(sumAvg)));

        

}