Question

我希望用户从JOptionPane中选择一个选项。然后我想在if语句中使用该选项。但我不知道该怎么做？这是我的代码：

import javax.swing.JOptionPane;
public class MortgageCalculator {

    public static void main(String[]args)
    {
        JOptionPane.showMessageDialog(null, "Lets calculate your mortgage",null, JOptionPane.PLAIN_MESSAGE);

        double principle = Double.parseDouble(JOptionPane.showInputDialog(null, "What is your loan amount?"));

        int years = Integer.parseInt(JOptionPane.showInputDialog(null,"Enter the lenght of your loan"));
        int n = years * 12;

        double rate = Double.parseDouble(JOptionPane.showInputDialog(null, "What is your interest rate?"));

        String[] options = new String[] {"Compound", "Simple"};

        int response = JOptionPane.showOptionDialog(null, null, "Choose your interest type", JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE,null, options, options[0]);

        //I want to use my selected option here. 
        if(options ==compound)
        {
            double payment = (compound(principle,years,rate))/n;

        }
        else
        {
            double payment = (simple(principle, years, rate))/n;
        }
    }

    public static double simple(double principle, int n , double interestRate)
    {
        double interest = principle * n * (interestRate/100);
        double totalLoan = principle + interest;
        return totalLoan;
    }

    public static double compound(double principle, int years, double interestRate)
    {
        int n = years * 12;
        double base = (principle* (1+ (interestRate/100)*1/n));
        double amount = Math.pow(base, n);
        return amount;
    }

顺便说一句，这不是一个完整的代码。语法缺失。谢谢您的帮助。

Answer 1

当你的按钮被提供给String数组中的对话框时，当选择该按钮时，它是该按钮名称所在的索引值，返回的数组。

复合会从对话框中返回 0 的索引值，简单会返回 1 的索引值>

// Compound (0)
if(response == 0) {
    double payment = (compound(principle,years,rate))/n;

}
// Simple (1)
else {
    double payment = (simple(principle, years, rate))/n;
}

检查响应变量中的值....不是选项。

如何在if语句中使用用户从JOptionPane中选择的选项？

1 个答案: