//ItemMinimumDouble.java

public class ItemMinimumDouble
{

    public static <TheType extends Number>
    Double tripleAvg
    (
        TheType item1,
        TheType item2,
        TheType item3
    )
    {
        Double tripleSum;

        //tripleSum = item1 + item2 + item3; //Does not compile
        tripleSum = item1.doubleValue() +
                    item1.doubleValue() +
                    item1.doubleValue();

        return tripleSum / 3.0;
    }

    public static void main(String[] args)
    {
        Integer intVal1 = 55;
        Integer intVal2 = 99;
        Integer intVal3 = 66;

        Double doubleVal1 = 14.5;
        Double doubleVal2 = 12.3;
        Double doubleVal3 = 1.75;

        // Try tripleAvg method with Integers
        System.out.println
        (
            "Items: " + intVal1 + " " + intVal2 + " " + intVal3
        );
        System.out.println
        (
            "Avg: " + tripleAvg(intVal1, intVal2, intVal3) + "\n"
        );

        // Try tripleAvg method with Doubles
        System.out.println
        (
            "Items: " + doubleVal1 + " " + doubleVal2 + " " + doubleVal3
        );
        System.out.println
        (
            "Avg: " + tripleAvg(doubleVal1, doubleVal2, doubleVal3) + "\n"
        );
    }
}