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// KmToMilesMethods.java -- Converts kilometers to miles.
// Michael Maus, 9 Sept 2004
//
// Note: Move input methods to their own class.
import javax.swing.*;
import java.text.*;
public class KmToMilesInputClass {
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.
IOHandler io;
//... Initialization
io = new IOHandler();
//... Input
kilometers = io.getDouble("Enter number of kilometers.");
//... Computation
miles = kilometers * MILES_PER_KILOMETER;
//... Output
io.putString(kilometers + " kilometers is "
+ ONE_DECIMAL_PLACE.format(miles) + " miles.");
//... Stop
System.exit(0); // Stop GUI program
}
}
class IOHandler {
public double getDouble(String prompt) {
String tempStr;
tempStr = JOptionPane.showInputDialog(null, prompt);
return Double.parseDouble(tempStr);
}
public void putString(String output) {
JOptionPane.showMessageDialog(null, output);
}
}
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