It would appear to have been decided that the use of non-standard libraries is permissible (unless the question specifies otherwise), on the condition that the library being used is freely available and predates the asking date of the question.

Would requiring a non-standard preprocessor be permissible under the same set of conditions?

  • \$\begingroup\$ Can you give an example? \$\endgroup\$
    – Alex A.
    Commented Oct 25, 2015 at 20:02
  • \$\begingroup\$ Well, I'm in the process of writing a Java preprocessor that would allow aliasing imports. (The preprocessor would automatically replace the specified aliases with the fully qualified class names.) But this question would likely cover other situations as well. \$\endgroup\$ Commented Oct 25, 2015 at 20:04
  • \$\begingroup\$ I may not be understanding correctly, but to me it sounds like you're in a way creating an interpreter for a golfed Java. \$\endgroup\$
    – Alex A.
    Commented Oct 25, 2015 at 20:05
  • \$\begingroup\$ It would convert it into standard java source, which would then be compiled and run normally. \$\endgroup\$ Commented Oct 25, 2015 at 20:05
  • \$\begingroup\$ Right, that's what some interpreters do. :) \$\endgroup\$
    – Alex A.
    Commented Oct 25, 2015 at 20:24
  • \$\begingroup\$ some interpreters \$\endgroup\$
    – Alex A.
    Commented Oct 25, 2015 at 20:26
  • \$\begingroup\$ But it does not (at least in the current version) handle the rest of the compilation automatically. I suppose I could write a windows batch wrapper to do that though. \$\endgroup\$ Commented Oct 25, 2015 at 20:28
  • \$\begingroup\$ It's also not exclusively for code golfing, it has other uses (for example, when you need to import two distinct classes which have the same simple [unprefixed] name.) Also, it's sometimes convenient to be able to refer to one specific List implementation as simply "List" \$\endgroup\$ Commented Oct 25, 2015 at 20:46
  • \$\begingroup\$ As long as the code you're writing follows the Java spec, it seems to me that it's valid Java code regardless of what preprocessor you use. \$\endgroup\$
    – lirtosiast
    Commented Oct 25, 2015 at 22:36
  • \$\begingroup\$ Standard java does not support aliased imports, so this custom preprocessor would convert java code which uses aliased imports into standard java code. \$\endgroup\$ Commented Oct 26, 2015 at 0:43

1 Answer 1


It's the compiler of a new language that compiles into Java.

Just like CoffeeScript:

CoffeeScript is a little language that compiles into JavaScript.

And the other steps are handled by a JavaScript interpreter.

The "new language" can be a language under a different name based on Java, or a dialect of Java. As your language doesn't likely match the Java specification, and probably won't be accepted by other Java users, it's safer to call it a language under a different name. You can still call it something like Preprocessed Java, though.


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