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Encapsulating Constants in a Program

interface ConversionFactors {   double INCH_TO_MM = 25.4;   double OUNCE_TO_GRAM = 28.349523125;   double POUND_TO_GRAM = 453.5924;   double HP_TO_WATT = 745.7;   double WATT_TO_HP = 1.0 / HP_TO_WATT; } public class MainClass {   public static void main(String[] a) {     System.out.println(ConversionFactors.INCH_TO_MM);   } } 25.4