Returns a string representation of the object. In general, the
toString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
toString method for class
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
getClass().getName() + '@' + Integer.toHexString(hashCode())