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Re: [jdt-core-dev] [1.5] Generic methods now supported
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In my previous example, I forgot to mention that the type inference
involved for generic methods is also able to recurse in supertypes.
If you pay attention to the testcase, you'll observe that #sort is
expecting a List<T>, where it is supplied a LinkedList<String>.
Since LinkedList is defined as:
public class LinkedList<E>
extends AbstractSequentialList<E>
implements List<E>, Queue<E>, ... etc ...
LinkedList<String> implements List<String>, which is then matching List<T>
given 'T' is substituted by 'String'.
Under the same rules, you could even supply an instance of C as an argument
to #sort, where C is defined as:
public class C extends LinkedList<String>
which would result in 'T' associated with 'String', as well.
Philippe P
Mulet/France/IBM@
IBMFR To
Sent by: jdt-core-dev@xxxxxxxxxxx
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Subject
[jdt-core-dev] [1.5] Generic
04/15/2004 01:29 methods now supported
AM
Please respond to
jdt-core-dev
I just released changes which allow Cheetah to digest more evolved generic
method scenarii.
public class X {
public static void main(String [] args) {
java.util.Collections.sort(new java.util.LinkedList<String>());
}
}
fyi, the method Collections#sort is spec'ed in a nasty way, as the bound
for variable T is referencing itself,
which makes the job for checking the bound of inferred type (String in
example above) a bit tricky.
public static <T extends Comparable<? super T>> void sort(List<T> list)
We will sanity check the Cheetah, and post an updated preview shortly if
successful.
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