First use of a class

Here is the code for the MilesToKilometersConversion class

The code is also available at Github

package com.spconger.MilesToKilometers;

public class MilesToKilometersConversion {
 /**
  * This class takes miles as an argument
  * and converts it to kilometers
  * 7/1/2013
  */
 //private fields
 private double miles;
 private double kilometers;
 //private constant 
 private final double CONVERSIONFACTOR=1.6;
 
 //empty constructor
 public MilesToKilometersConversion(){
  setMiles(0);
  setKilometers(0);
 }
 
 //constructor that takes miles as a parameter
 public MilesToKilometersConversion(double miles){
  setMiles(miles);
  setKilometers(0);
 }

 //public sets and gets for private fields
 public double getMiles() {
  return miles;
 }

 public void setMiles(double miles) {
  this.miles = miles;
 }

 public double getKilometers() {
  return kilometers;
 }

 public void setKilometers(double kilometers) {
  this.kilometers = kilometers;
 }
 
 //public method to convert miles to kilometers
 public void convertToKilometers(){
   setKilometers(getMiles() * CONVERSIONFACTOR);
 }

}

---

Here is the Program

package com.spconger.MilesToKilometers;
import acm.program.*;
import acm.graphics.*;
import acm.io.IODialog;;

@SuppressWarnings("serial")
public class Program extends GraphicsProgram{
 /**
  * this class gets the Miles from the user
  * with a dialog box and passes it to the 
  * MilesToKilometersConversion class
  * which does the conversion and passes the 
  * kilometers value back to a label
  * 7/1/2013
  */
 public void run(){
  setSize(400,500);
  //create a dialog box
  IODialog dialog = new IODialog();
  //get the value from the dialog
  double miles = dialog.readDouble("Please enter the miles");
  //initialize the class and pass the miles
  //in the constructor
  MilesToKilometersConversion  mToK=
    new MilesToKilometersConversion(miles);
  //call the conversion method
  mToK.convertToKilometers();
  //Display the results in a label
  GLabel label=new GLabel(miles +
    " equals  " +mToK.getKilometers()
    + " Kilometers", 50,60);
  //add the label to the graphics program
  add(label);
 }
}