DevFaqLookupGenerics
How do I use Java Generics with Lookup?
As of NetBeans 6, a number of convenience methods have been added to lookup, and support for Java generics has been added to Lookup. The following are differences:
| NB 5.x Code | NB 6 Code | |||
|---|---|---|---|---|
Lookup.Result r = lkp.lookup( |} new Lookup.Template(X.class))| Lookup.Result<? extends X> r = lkp.lookupResult(X.class)
r.allInstances()</pre> | Collection<? extends X> c = lkp.lookupAll(X.class); The new style also works well with for-loops and avoids casts:
for (SomeService s : Lookup.getDefault().lookupAll(SomeService.class)) {
// ...
}
// ...
SomeSingleton s = Lookup.getDefault().lookup(SomeSingleton.class);
if (s != null) {
// ...
}
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