Generics Made Easy - Part 2

Double.compare(d1,d2)

·         d1 -- first double to compare

·         d2 -- second double to compare.

0, if d1 is numerically equal to d2;

<0, if d1 is numerically less than d2;

>0, if d1 is numerically greater than d2.

General Format:

package org.generics;

public class MaximumTestFirst {

        public static void main(String[] args) {

                System.out.println(maximum(7.5, 6.5));

        }

        private static double maximum(double d1, double d2) {

                double max = d1;

                if (Double.compare(max, d2) < 0) {

                        max = d2; // d2 is the largest so far

                }

                return max;

        }

}

Generics Standard Format:

package org.generics;

public class MaximumTestFirst {

        public static void main(String[] args) {

                System.out.println(maximum(7.5, 6.5));

        }

        private static <T extends Comparable<T>> T maximum(T d1, T d2) {

                T max = d1;

                if (d2.compareTo(max) > 0) {

                        max = d2; // d2 is the largest so far

                }

                return max;

        }

}

Converting area:

Method type	double	<T extends Comparable<T>> T
Parameter type	(double d1, double d2)	(T d1, T d2)
Differences	Double.compare(max, d2)	d2.compareTo(max)