Returns an integer indicating the order of this object relative to another object.
For the order we consider only the x-value: negative == "less-than", zero == "equal", positive == "greater-than".
@param o1 the object being compared to.
@return An integer indicating the order of this data pair objectrelative to another object.
All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.