Mine

/*
 * BasicMethodsLab.java
 *
 * Created on February 8, 2007, 9:56 AM
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package lab03;
import javax.swing.*;
import java.text.*;
public class BasicMethodsLab {
    
    public static void main( String args[] ) {
        
        String propertyCostStr;       // Value entered by user; string type
        String downPaymentStr;        // Value entered by user; string type
        String numberOfYearsStr;      // Value entered by user; string type
        String propertyStr;           // Letter entered by user; string type
        char propertyType;            // Storing the letter chosen by the user
        double propertyCost;          // The double form of the user-entered property cost
        double downPayment = 0;       // The double form of the user-entered down payment
        double loanAmount = 0;        // The calculated price of the loan amount
        double monthlyPayment;        //The monthly loan payment
        double annualInterestRate;    //The annual interest rate
        double result = 0;
        int response = 0;             // The user's response as to whether to continue
        int numberOfYears = 0;	  //integer form of the user-entered down payment
        
        DecimalFormat prec2 = new DecimalFormat("$#.00");
        
        
        // Initialize the output string to the empty string
        String outputStr = "";
        
        while (true) {
            // Read in item price from user as a string
            propertyCostStr = JOptionPane.showInputDialog("Enter property cost");
            
            // Convert from type String to type double
            propertyCost = Double.parseDouble(propertyCostStr);
            
            // Read in number ordered from user as a string
            downPaymentStr = JOptionPane.showInputDialog("Enter down payment");
            
            // Convert from type String to type double
            downPayment = Double.parseDouble(downPaymentStr);
            
            // Read in number of years from user as a string
            numberOfYearsStr = JOptionPane.showInputDialog("Enter number of years for loan:");
            
            propertyType = 'R';
            propertyType = 'C';
            propertyType = 'A';
            
            //Read in category from user as a number
            propertyStr = JOptionPane.showInputDialog("Choose the letter that best corresponds with your" +
                    "property type" +
                    "\nR. Residential "
                    +"\nC. Commercial \nA. Argricultural");
            
            // Convert from type String to type integer
            numberOfYears = Integer.parseInt(numberOfYearsStr);
            
            // Calculate loan amount for the property
            loanAmount = propertyCost - downPayment;
            
            // Echo print the entered values
            outputStr = outputStr + "Type: " + getPropertyTypeName(propertyType)+ ", ";
            outputStr = outputStr + "Cost: " + prec2.format(propertyCost) + ", ";
            outputStr = outputStr + "Loan Amount: " + prec2.format(loanAmount) + ", ";
            
            // Calculate monthly payment
            // Change the annual interest rate to a decimal (/100) and a monthly rate (/12)
            
            // Print the monthly payment
            outputStr = outputStr + "Monthly Amount: " + prec2.format(calculatePayment(propertyCost, downPayment,
                    numberOfYears, propertyType, loanAmount)) + ", " + "Number of Years: " +
                    numberOfYears + "\n" + "Total Amount Paid: " +
                    prec2.format(computeTotalPayment(result, numberOfYears));
            
            //Print the number of years for the loan
            
            // Determine whether the user wants to continue the loop
            response = JOptionPane.showConfirmDialog(null, outputStr + "\nContinue?", "Confirm",
                    JOptionPane.YES_NO_OPTION,
                    JOptionPane.QUESTION_MESSAGE);
            
            if (response == JOptionPane.NO_OPTION)
                break;
        }
        
        // Display final output to the user
        JOptionPane.showMessageDialog(
                null, outputStr, "Property Loan Amounts", JOptionPane.INFORMATION_MESSAGE);
        
        System.exit( 0 );      // Terminate the program
    }
    
    static double calculatePayment(double propertyCost, double downPayment, int numberOfYears,
            char propertyType, double loanAmount){
        double subResult = 0.075;
        double result = 0;
        switch (propertyType){
            case 'R':
            case 'r': subResult = computeResidentialPayment(propertyCost, downPayment, numberOfYears);break;
            case 'C':
            case 'c': subResult = computeCommercialPayment(propertyCost, downPayment, numberOfYears);break;
            case 'A':
            case 'a': subResult = computeAgriculturalPayment(propertyCost, downPayment, numberOfYears);break;
            default: subResult = computeResidentialPayment(propertyCost, downPayment, numberOfYears);break;
        }
        result = computeMonthlyPayment(loanAmount, subResult, numberOfYears);
        return result;
    }
    
    static double computeResidentialPayment(double propertyCost, double downPayment, int numberOfYears) {
        double annualInterestRate;
        double loanAmount;
        if ((propertyCost/downPayment) < 0.2)
            annualInterestRate = 0.0575;
        else
            annualInterestRate = 0.0675;
        return annualInterestRate;
    }
    
    static double computeCommercialPayment(double propertyCost, double downPayment, int numberOfYears) {
        double annualInterestRate;
        double loanAmount;
        if ((propertyCost/downPayment) < 0.3)
            annualInterestRate = 0.086;
        else
            annualInterestRate = 0.096;
        return annualInterestRate;
    }
    
    static double computeAgriculturalPayment(double propertyCost, double downPayment, int numberOfYears) {
        double annualInterestRate;
        double loanAmount;
        if ((propertyCost/downPayment) < 0.1)
            annualInterestRate = 0.0525;
        else
            annualInterestRate = 0.0625;
        return annualInterestRate;
    }
    
    static double computeMonthlyPayment(double loanAmount, double subResult, int numberOfYears) {
        double monthlyPayment;
        // Change the annual interest rate to a decimal (/100) and a monthly rate (/12)
        monthlyPayment = loanAmount * (subResult/1200) /
                (1 - 1 / Math.pow(1 + (subResult/1200), numberOfYears * 12));
        return monthlyPayment;
    }
    
    static double computeTotalPayment(double result, int numberOfYears) {
        double total = 0;
        total = result * numberOfYears * 12;
        return total;
    }
    
    static String getPropertyTypeName(char propertyType){
        String propertyName;
        switch (propertyType) {
            case 'R':
            case 'r': propertyName = ("Residential"); break;
            case 'C':
            case 'c': propertyName = ("Commercial"); break;
            case 'A':
            case 'a': propertyName = ("Agricultural"); break;
            default: propertyName = ("Residential"); break;
        }
        return propertyName;
    }
    
    
}