我需要一些关于如何以“.5％”格式获得第2和第4个百分比的提示，因为在我的结果中我得到的结果是正确的，但它以整个百分比打印。因此它没有显示出4％，4.5％，5％，5.5％和6％。 4％，4％，5％，6％，6％但它仍能正确计算结果。它似乎没有显示4.5％和5.5％。下面是代码，它可能看起来很长但只是重复的数字。注意aIR2和aIR4，这些是目标
import java.util.Scanner;
import java.text.NumberFormat;
import java.text.DecimalFormat;
public class MortgageCalculator {
public static void main(String[] args) {
double aIR, mortgageAmount;
int noY;
double aIR1, aIR2, aIR3, aIR4, aIR5;
double mIR1, mIR2, mIR3, mIR4, mIR5;
double mPayment1, mPayment2, mPayment3, mPayment4, mPayment5;
double totAmount1, totAmount2, totAmount3, totAmount4, totAmount5;
double oPay1, oPay2, oPay3, oPay4, oPay5;
double oPaypercent1, oPaypercent2, oPaypercent3, oPaypercent4, oPaypercent5;
//This establishes formats for values
NumberFormat fmt1 = NumberFormat.getPercentInstance();
NumberFormat fmt2 = NumberFormat.getCurrencyInstance();
DecimalFormat fmt3 = new DecimalFormat("0.##");
//This asks user for inputs
Scanner scan = new Scanner(System.in);
System.out.println("Enter the Annual Interest Rate: ");
aIR= scan.nextDouble();
System.out.println("Enter the Number of Years you will Pay: ");
noY = scan.nextInt();
System.out.println("Enter Amount Borrowed from the Bank: ");
mortgageAmount = scan.nextInt();
//These will give annual interest rates depending on range
aIR1 = (aIR - 1)/100;
aIR2 = (aIR - 0.5)/100;
aIR3 = (aIR)/100;
aIR4 = (aIR + 0.5)/100;
aIR5 = (aIR + 1)/100;
//These give rates by month according to which rate being taken
mIR1 = (aIR1 / 12);
mIR2 = (aIR2 / 12);
mIR3 = (aIR3 / 12);
mIR4 = (aIR4 / 12);
mIR5 = (aIR5 / 12);
//This takes the amounts per month
mPayment1 = (mIR1 * mortgageAmount)/(1-(1/Math.pow((1+mIR1),12*noY)));
mPayment2 = (mIR2 * mortgageAmount)/(1-(1/Math.pow((1+mIR2),12*noY)));
mPayment3 = (mIR3 * mortgageAmount)/(1-(1/Math.pow((1+mIR3),12*noY)));
mPayment4 = (mIR4 * mortgageAmount)/(1-(1/Math.pow((1+mIR4),12*noY)));
mPayment5 = (mIR5 * mortgageAmount)/(1-(1/Math.pow((1+mIR5),12*noY)));
//This takes the total amount per year
totAmount1 = mPayment1 * (noY*12);
totAmount2 = mPayment2 * (noY*12);
totAmount3 = mPayment3 * (noY*12);
totAmount4 = mPayment4 * (noY*12);
totAmount5 = mPayment5 * (noY*12);
//This is the overpayment because of interest
oPay1 = totAmount1 - (mortgageAmount);
oPay2 = totAmount2 - (mortgageAmount);
oPay3 = totAmount3 - (mortgageAmount);
oPay4 = totAmount4 - (mortgageAmount);
oPay5 = totAmount5 - (mortgageAmount);
//This is the overpayment percentage
oPaypercent1 = (oPay1/mortgageAmount);
oPaypercent2 = (oPay2/mortgageAmount);
oPaypercent3 = (oPay3/mortgageAmount);
oPaypercent4 = (oPay4/mortgageAmount);
oPaypercent5 = (oPay5/mortgageAmount);
//Begins printing the results in a line
System.out.println("The Mortgage Amount is: "
+ fmt2.format(mortgageAmount));
System.out.println("The Number of Years the Mortgage is Held: " + noY);
System.out.println("Range of Interest Rates: " + fmt1.format(aIR1)
+ " - " + fmt1.format(aIR5));
System.out.println("Interest Rate Monthly Payment Total Payment"
+ " $ Overpayment % Overpayment");
//Prints first interest rate
System.out.println("" + fmt1.format(aIR1) + " " +
fmt2.format(mPayment1) + " " + fmt2.format(totAmount1)
+ " " + fmt2.format(oPay1) + " "
+ fmt1.format(oPaypercent1) + "");
//Prints second interest rate
System.out.println("" + fmt1.format(aIR2) + " " +
fmt2.format(mPayment2) + " " + fmt2.format(totAmount2)
+ " " + fmt2.format(oPay2) + " "
+ fmt1.format(oPaypercent2) + "");
//Prints third interest rate
System.out.println("" + fmt1.format(aIR3) + " " +
fmt2.format(mPayment3) + " " + fmt2.format(totAmount3)
+ " " + fmt2.format(oPay3) + " "
+ fmt1.format(oPaypercent3) + "");
//Prints fourth interest rate
System.out.println("" + fmt1.format(aIR4) + " " +
fmt2.format(mPayment4) + " " + fmt2.format(totAmount4)
+ " " + fmt2.format(oPay4) + " "
+ fmt1.format(oPaypercent4) + "");
//Prints fifth interest rate
System.out.println("" + fmt1.format(aIR5) + " " +
fmt2.format(mPayment5) + " " + fmt2.format(totAmount5)
+ " " + fmt2.format(oPay5) + " "
+ fmt1.format(oPaypercent5) + "");
}
}
答案 0 :(得分：1)
如果您希望显示NumberFormat和4%的{{1}}，即具有单个可选小数位的百分比值，请执行以下操作之一：
4.5%答案 1 :(得分：1)
应更改格式化利率以处理小数百分比值。
import java.util.Scanner;
import java.text.NumberFormat;
import java.text.DecimalFormat;
public class HelloWorld {
public static void main(String[] args) {
double aIR, mortgageAmount;
int noY;
double aIR1, aIR2, aIR3, aIR4, aIR5;
double mIR1, mIR2, mIR3, mIR4, mIR5;
double mPayment1, mPayment2, mPayment3, mPayment4, mPayment5;
double totAmount1, totAmount2, totAmount3, totAmount4, totAmount5;
double oPay1, oPay2, oPay3, oPay4, oPay5;
double oPaypercent1, oPaypercent2, oPaypercent3, oPaypercent4, oPaypercent5;
//This establishes formats for values
NumberFormat fmt1 = new DecimalFormat("0.#%");
//NumberFormat fmt1 = NumberFormat.getPercentInstance();
NumberFormat fmt2 = NumberFormat.getCurrencyInstance();
DecimalFormat fmt3 = new DecimalFormat("0.##");
//This asks user for inputs
Scanner scan = new Scanner(System.in);
System.out.println("Enter the Annual Interest Rate: ");
aIR= scan.nextDouble();
System.out.println("Enter the Number of Years you will Pay: ");
noY = scan.nextInt();
System.out.println("Enter Amount Borrowed from the Bank: ");
mortgageAmount = scan.nextInt();
//These will give annual interest rates depending on range
aIR1 = (aIR - 1)/100;
aIR2 = (aIR - 0.5)/100;
aIR3 = (aIR)/100;
aIR4 = (aIR + 0.5)/100;
aIR5 = (aIR + 1)/100;
//These give rates by month according to which rate being taken
mIR1 = (aIR1 / 12);
mIR2 = (aIR2 / 12);
mIR3 = (aIR3 / 12);
mIR4 = (aIR4 / 12);
mIR5 = (aIR5 / 12);
//This takes the amounts per month
mPayment1 = (mIR1 * mortgageAmount)/(1-(1/Math.pow((1+mIR1),12*noY)));
mPayment2 = (mIR2 * mortgageAmount)/(1-(1/Math.pow((1+mIR2),12*noY)));
mPayment3 = (mIR3 * mortgageAmount)/(1-(1/Math.pow((1+mIR3),12*noY)));
mPayment4 = (mIR4 * mortgageAmount)/(1-(1/Math.pow((1+mIR4),12*noY)));
mPayment5 = (mIR5 * mortgageAmount)/(1-(1/Math.pow((1+mIR5),12*noY)));
//This takes the total amount per year
totAmount1 = mPayment1 * (noY*12);
totAmount2 = mPayment2 * (noY*12);
totAmount3 = mPayment3 * (noY*12);
totAmount4 = mPayment4 * (noY*12);
totAmount5 = mPayment5 * (noY*12);
//This is the overpayment because of interest
oPay1 = totAmount1 - (mortgageAmount);
oPay2 = totAmount2 - (mortgageAmount);
oPay3 = totAmount3 - (mortgageAmount);
oPay4 = totAmount4 - (mortgageAmount);
oPay5 = totAmount5 - (mortgageAmount);
//This is the overpayment percentage
oPaypercent1 = (oPay1/mortgageAmount);
oPaypercent2 = (oPay2/mortgageAmount);
oPaypercent3 = (oPay3/mortgageAmount);
oPaypercent4 = (oPay4/mortgageAmount);
oPaypercent5 = (oPay5/mortgageAmount);
//Begins printing the results in a line
System.out.println("The Mortgage Amount is: "
+ fmt2.format(mortgageAmount));
System.out.println("The Number of Years the Mortgage is Held: " + noY);
System.out.println("Range of Interest Rates: " + fmt1.format(aIR1)
+ " - " + fmt1.format(aIR5));
System.out.println("Interest Rate Monthly Payment Total Payment"
+ " $ Overpayment % Overpayment");
//Prints first interest rate
System.out.println("" + fmt1.format(aIR1) + " " +
fmt2.format(mPayment1) + " " + fmt2.format(totAmount1)
+ " " + fmt2.format(oPay1) + " "
+ fmt1.format(oPaypercent1) + "");
//Prints second interest rate
System.out.println("" + fmt1.format(aIR2) + " " +
fmt2.format(mPayment2) + " " + fmt2.format(totAmount2)
+ " " + fmt2.format(oPay2) + " "
+ fmt1.format(oPaypercent2) + "");
//Prints third interest rate
System.out.println("" + fmt1.format(aIR3) + " " +
fmt2.format(mPayment3) + " " + fmt2.format(totAmount3)
+ " " + fmt2.format(oPay3) + " "
+ fmt1.format(oPaypercent3) + "");
//Prints fourth interest rate
System.out.println("" + fmt1.format(aIR4) + " " +
fmt2.format(mPayment4) + " " + fmt2.format(totAmount4)
+ " " + fmt2.format(oPay4) + " "
+ fmt1.format(oPaypercent4) + "");
//Prints fifth interest rate
System.out.println("" + fmt1.format(aIR5) + " " +
fmt2.format(mPayment5) + " " + fmt2.format(totAmount5)
+ " " + fmt2.format(oPay5) + " "
+ fmt1.format(oPaypercent5) + "");
}
输出
利率每月付款总额付款$多付％多付款
4％$ 1,841.65 $ 110,499.13 $ 10,499.13 10.5％
4.5％$ 1,864.30 $ 111,858.12 $ 11,858.12 11.9％
5％$ 1,887.12 $ 113,227.40 $ 13,227.40 13.2％
5.5％$ 1,910.12 $ 114,606.97 $ 14,606.97 14.6％
6％$ 1,933.28 $ 115,996.81 $ 15,996.81 16％