Go doesn't require an explicit class definition as Java, C++, C#, etc do. Instead, a "class" is implicitly defined by providing a set of "methods" which operate on a common type. The type may be a struct or any other user-defined type. For example:
type Integer int
func (i *Integer) String() string {
return strconv.itoa(i)
}... is analogous to:
class Integer {
public int i;
public String toString() { return Integer.toString(i); }
}
... in Java.