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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
static method
In object-oriented programming, a function
packaged along with a given class; not really a method at all.
For example, a String class might include a static method,
concatenate(), which returns its arguments joined into one
string. It might be called like this:
print String.concatenate("FOL", "DOC");
which would print "FOLDOC".
The same result might be achieved with a real object method,
append(), which returns its argument string appended to the object
it is invoked on, e.g.:
String s = "FOL";
print s.append("DOC");
While the syntax looks similar, the two are completely
different. The static method is just a function called
"String.concatenate" which can be resolved to the address of some
code at compile time (or load time if the String class is
dynamically loaded). When invoking an object method, the class of
the object is not generally known until run time so method
lookup is a run-time process.
(2014-09-06)