On Jun 30, 2010, at 4:09 AM, Paul Moore wrote:
Based on this comment, maybe I could ask an alternative question - can
you suggest where I should go to read some tutorials which would give
me a fast start on "just enough" Java infrastructure to get
comfortable in Clojure? Most of the Java tutorials I've seen tend to
assume I want to learn Java - I know enough Java to read code samples,
and that'll do for what I want.
Off the top of my head, the only "must have" piece of knowledge is how
namespaces and source files relate to the classpath, which is
described here:
http://clojure.org/libs
If you're not clear on what the classpath is: in rough terms, it's the
same as PATH or PYTHONPATH, but can include .jar and .zip files as
additional search roots, and all JVM resources are loaded from it.
Classes (and namespaces) are loaded using a path corresponding to
their full name, with each name segment corresponding to a path segment.
In short, put all your source files in directories corresponding to
their namespace segments within a 'src' directory, make sure that
'src' directory is on your classpath (java -cp src:clojure.jar
clojure.main, for example), and you're good to go; require and use
will work as they should.
Beyond that, you need to know about the underlying host to the extent
that you use its facilities and libraries. In that arena, the basics
are:
(.methodName instance arg1 arg2 ...)
(ClassName/staticMethodName arg1 arg2 ...)
(ClassName. ctor-arg1 ctor-arg2 ...)
Other handy (and sometimes necessary, depending on what specific
libraries, etc you're using) bits are described here:
http://clojure.org/java_interop
Cheers,
- Chas
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