[721] in java-interest
How does one tell if a variable is initialized?
daemon@ATHENA.MIT.EDU (Steve Drach)
Mon Jul 17 16:20:08 1995
Date: Mon, 17 Jul 1995 11:52:34 -0800 (PDT)
From: Steve Drach <Steve.Drach@Eng.Sun.COM>
Reply-To: Steve Drach <Steve.Drach@Eng.Sun.COM>
To: java-interest@java.Eng.Sun.COM
What's the proper or preferred idiom for determining whether a variable
contains a valid pointer to an object or not. The try statement is a little
awkward if you want to do something with an initialized variable. For
example:
Object o;
...
if (/* o is not null */) {
// do stuff not using o, but necessary because o exists
// do stuff using o
}
o = new Object();
Using a try statement, I have to do something like:
try {
// do stuff not using o
// do stuff using o
} catch (NullPointerException e) {
// undo stuff done not using o -- Oops! may not be possible
}
o = new Object();
I'd really like to just say:
if (o != null)
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