// KmToMilesMethods.java -- This program converts kilometers to miles.
// Michael Maus, 9 Sept 2004
//
// Note: Defines methods to make the input/output simpler.
import javax.swing.*;
import java.text.*;
public class KmToMilesMethods {
public static void main(String[] args) {
//... Constants
final double MILES_PER_KILOMETER = 0.621;
final DecimalFormat ONE_DECIMAL_PLACE = new DecimalFormat("0.0");
//... Variables
double kilometers; // Number of kilometers.
double miles; // Number of miles.
//... Input
kilometers = getDouble("Enter number of kilometers.");
//... Computation
miles = kilometers * MILES_PER_KILOMETER;
//... Output
putString(kilometers + " kilometers is "
+ ONE_DECIMAL_PLACE.format(miles) + " miles.");
//... Stop
System.exit(0); // Stop GUI program
}
public static double getDouble(String prompt) {
String tempStr;
tempStr = JOptionPane.showInputDialog(null, prompt);
return Double.parseDouble(tempStr);
}
public static void putString(String output) {
JOptionPane.showMessageDialog(null, output);
}
}