java 不支持_java不支持的操作异常
我想为我的代码创建三个不同的类：FutureValueApp,Validator和FinancialCalculations。但是，当我运行代码时，我收到以下错误信息，并且不知道如何解决此问题。java不支持的操作异常
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Exception in thread “main” java.lang.UnsupportedOperationException: Not supported yet.
at FutureValueApp.getDoubleWithinRange(FutureValueApp.java:64)
at FutureValueApp.main(FutureValueApp.java:17)
Java Result: 1
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这是到目前为止我的代码：
import java.util.*;
import java.text.*;
import java.util.Scanner;
public class FutureValueApp
{
public static void main(String[] args)
{
System.out.println(“Welcome to the Future Value Calculator\n”);
Scanner sc = new Scanner(System.in);
String choice = “y”;
while (choice.equalsIgnoreCase(“y”))
{
// get the input from the user
System.out.println(“DATA ENTRY”);
double monthlyInvestment = getDoubleWithinRange(sc,
“Enter monthly investment: “, 0, 1000);
double interestRate = getDoubleWithinRange(sc,
“Enter yearly interest rate: “, 0, 30);
int years = getIntWithinRange(sc,
“Enter number of years: “, 0, 100);
// calculate the future value
double monthlyInterestRate = interestRate/12/100;
int months = years * 12;
double futureValue = calculateFutureValue(
monthlyInvestment, monthlyInterestRate, months);
// get the currency and percent formatters
NumberFormat currency = NumberFormat.getCurrencyInstance();
NumberFormat percent = NumberFormat.getPercentInstance();
percent.setMinimumFractionDigits(1);
// format the result as a single string
String results =
“Monthly investment:\t”
+ currency.format(monthlyInvestment) + “\n”
+ “Yearly interest rate:\t”
+ percent.format(interestRate/100) + “\n”
+ “Number of years:\t”
+ years + “\n”
+ “Future value:\t\t”
+ currency.format(futureValue) + “\n”;
// print the results
System.out.println();
System.out.println(“FORMATTED RESULTS”);
System.out.println(results);
// see if the user wants to continue
System.out.print(“Continue? (y/n): “);
choice = sc.next();
sc.nextLine(); // discard any other data entered on the line
System.out.println();
}
}
private static int getIntWithinRange(Scanner sc, String enter_number_of_years_, int i, int i0) {
throw new UnsupportedOperationException(“Not supported yet.”); //To change body of generated methods, choose Tools | Templates.
}
private static double getDoubleWithinRange(Scanner sc, String enter_monthly_investment_, int i, int i0) {
throw new UnsupportedOperationException(“Not supported yet.”); //To change body of generated methods, choose Tools | Templates.
}
private static double calculateFutureValue(double monthlyInvestment, double monthlyInterestRate, int months) {
throw new UnsupportedOperationException(“Not supported yet.”); //To change body of generated methods, choose Tools | Templates.
}
}
Validator类
import java.util.Scanner;
public class Validator
{
public static double getDouble(Scanner sc, String prompt)
{
double d = 0.0;
boolean isValid = false;
while (isValid == false)
{
System.out.print(prompt);
if (sc.hasNextDouble())
{
d = sc.nextDouble();
isValid = true;
}
else
{
System.out.println(“Error! Invalid decimal value. Try again.”);
}
sc.nextLine(); // discard any other data entered on the line
}
return d;
}
public static double getDoubleWithinRange(Scanner sc, String prompt,
double min, double max)
{
double d = 0.0;
boolean isValid = false;
while (isValid == false)
{
d = getDouble(sc, prompt);
if (d <= min)
System.out.println(
“Error! Number must be greater than “ + min + “.”);
else if (d >= max)
System.out.println(
“Error! Number must be less than “ + max + “.”);
else
isValid = true;
}
return d;
}
public static int getInt(Scanner sc, String prompt)
{
int i = 0;
boolean isValid = false;
while (isValid == false)
{
System.out.print(prompt);
if (sc.hasNextInt())
{
i = sc.nextInt();
isValid = true;
}
else
{
System.out.println(“Error! Invalid integer value. Try again.”);
}
sc.nextLine(); // discard any other data entered on the line
}
return i;
}
public static int getIntWithinRange(Scanner sc, String prompt,
int min, int max)
{
int i = 0;
boolean isValid = false;
while (isValid == false)
{
i = getInt(sc, prompt);
if (i <= min)
System.out.println(
“Error! Number must be greater than “ + min + “.”);
else if (i >= max)
System.out.println(
“Error! Number must be less than “ + max + “.”);
else
isValid = true;
}
return i;
}
}
FinancialCalculations类
public class FinancialCalculations
{
public static double calculateFutureValue(double monthlyInvestment,
double monthlyInterestRate, int months)
{
double futureValue = 0;
for (int i = 1; i <= months; i++)
{
futureValue =
(futureValue + monthlyInvestment) *
(1 + monthlyInterestRate);
}
return futureValue;
}
}
我知道 “私人UnsupportedOperationException异常” 不应该是包括为了使代码正常工作，我需要公开，但这是如此混乱。
Myth丶恋晨
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