Nope. String is final. <Object> means, well, any Object. Wildcards
are useless in this scenario.
F
try this:
http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf
It's a bit dry but explains the whys and hows of generics and
wildcards.
Actually it should be NSDictionary<String, ? extends Object> or rather
just NSDictionary<String, ?> probably in that case... Otherwise you
can ONLY pass in literally an NSDictionary<String, Object> and not any
subclasses of the values. In Wonder, you'll see our variants of these
methods are:
public static String directActionUrl(WOContext context, String
directActionName, NSDictionary<String, ? extends Object>
queryParameters, Boolean secure, boolean includeSessionID)
I suppose you could argue that you should be instantiating an
NSDictionary<String, Object> instead of a <String, String> but the
method technically takes a map from String to any object type, so I
think the ? better expresses the intent.
Incidentally, I was just parameterizing some methods in
ERXArrayUtilities and, while generics look sort of ugly, they really
do help in use:
public static NSDictionary arrayGroupedByKeyPath(NSArray objects,
String keyPath, boolean includeNulls, String valueKeyPath) {
vs
public static <T, K, V> NSDictionary<K, NSArray<V>>
arrayGroupedByKeyPath(NSArray<T> objects, ERXKey<K> keyPath, boolean
includeNulls, ERXKey<V> valueKeyPath) {
I really like how explicit the the second one is ... You're going to
get a dictionary back where the keys are the same type as the keypath
you passed in and the values are the same type as the value key path
you passed in ... Even without the added docs explaining what this
does, you can almost guess by matching the types up with param types.
ms
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