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please explain this syntax

nirjari patel
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Joined: Apr 23, 2009
Posts: 377

How does this syntax work ?
Does it add "data" and "something" both ?
Does it not need to be added separately ?
If we can ad teo elements in one statement, then can we add three elements in one statement ?


Seetharaman Venkatasamy
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Joined: Jan 28, 2008
Posts: 5575

what is the doc ?
Greg Charles

Joined: Oct 01, 2001
Posts: 2867

Whatever "doc" may be, the addElement() method returns "this", that is a reference to the doc object itself. Why? To enable the kind of syntax you posted here, which can, at times, be convenient. It's called the Method Chaining pattern.
Joanne Neal

Joined: Aug 05, 2005
Posts: 3742
Greg Charles wrote:Whatever "doc" may be, the addElement() method returns "this", that is a reference to the doc object itself.

Not necessarily. addElement could return an instance of any class that has an addElement(String) method.
Without knowing the type of 'doc', you can't say what addElement returns.
cchetan jain
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Joined: Jul 05, 2009
Posts: 30
firstly doc is in object.after applying the method addElement() on it .it returns an object(may be it is object of the type of doc)..on which by chaining rule again the addElement()method is applied..and now it adds 'something' to it..clear or not??
I agree. Here's the link:
subject: please explain this syntax