March 15, 2010
Joe Darcy: Beware of Covariant Overriding in Interface Hierarchies.
One of the changes to the Java programming language made back in JDK 5 was the introduction of
covariant returns, that is, the ability in a subtype to override a method in a supertype and return a more specific type. For example,
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March 14, 2010
Stephen Colebourne: Java language design by use case.
In a blog in 2006 Neal Gafter
wrote
about how language design was fundamentally different to API design and how use cases
were a bad approach to language design.
This blog questions some of those conclusions in the context of the Java language.
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NetBeans Screenshot of the Week #36: Python Code Completion
Here are some screenshots of the code completion working for Python.
First, let's try it from an import statement:
Note that the documentation for the module is shown. Next, let's
try completing on imported symbols - again we've got the documentation:
I'm writing a unit test, extending TestCase. Now let's try overriding
some methods - completion after typing def:
Obviously, invoking methods on self. will show the inherited
methods - and their documentation:
Here's completion in my function (not on self) showing
the local variables, imported symbols and builtins. Notice that deprecated
methods are marked with strikethrough (and deprecated modules are in imports
as well, though I didn't show that above).
Notice also that the documentation here looks better - it has links,
colors, etc. This is because NetBeans supports the reStructuredText
Docstring Format (see PEP 287).
System libraries are being documented in this way now, so more of the
documentation will start looking like this.
When NetBeans finds embedded code, it will also syntax highlight the
code fragments in the documentation:
You can use this in your own documentation as well obviously.
Here's a file where I have restructured text. As I'm writing it,
I can -immediately- preview the text myself by just pressing
Ctrl-Shift-Space (Show Documentation - for those who don't know, you
can do this on regular code as well if you want to just get the document...
Date: November, 14 2008
Url: http://blogs.sun.com/tor/entry/netbeans_screenshot_of_the_week3
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