Application part of the Code

The application part looks much like the previous example, except that now there are two values input from text fields. The event listener will keep them separate.

public class PercentFat extends JFrame implements ActionListener
{

  double calories ;   // input: total calories
  double fatGrams ;   // input:  grams of fat
  double percent ;    // result: percent of calories from fat
    
  public PercentFat()  // constructor  
  {  
    . . . . .
  }
   
  // Application method
  public void calcPercent()  
  {
    percent = ( (fatGrams * 9) / calories ) * 100 ;
  }
   
   
  // GUI code
  . . . . .
   
  public static void main ( String[] args )
  {
    PercentFat fatApp  = new PercentFat() ;
    
    . . . . .
  }
}