public version

import org.junit.Test;

import static org.junit.Assert.*;

public class NumberUtils {

    /**

     * @param num A number of type T

     * @return true iff num is greater than 0

     * @param <T> A type that extends Number

     */

    public static <T extends Number> boolean amIPositive(T num) {

        return num.doubleValue() > 0;

    }

    @Test

    public void testAmIPositive() {

        assertTrue(amIPositive(5));

        assertFalse(amIPositive(0));

        assertFalse(amIPositive(-3));

        assertTrue(amIPositive(3.14));

        assertFalse(amIPositive(0.0));

        assertFalse(amIPositive(-2.5));

        assertTrue(amIPositive(2.0f));

        assertFalse(amIPositive(0.0f));

        assertFalse(amIPositive(-1.5f));

    }

}