Groovy

edit

Summary

Memorize keywords, tips and code snippets for Groovy, the Java-based scripting language.

edit

Question	Answer
print a string	println "hi"
run a groovy script (from the command-line)	groovy hi.groovy
string with variable	"hi ${s}"
string with expression	"hi ${1 + 2}"
define a variable	def s
multi-line string	"""foo bar"""
assert statement	assert s == "foo"
	memorize

edit

Several example variable names are used, for brevity. Assume the following variables have been defined:

String s, List l, Map m, File f, Object o (example misc object)

Groovy code has access to almost all standard Java classes and methods but I haven't, of course, listed them all here.

edit

Question	Answer
closure	block of code passed as a parameter
it	explicit variable passed to closure (if none are defined)
groovy-starter.conf (in conf/ dir)	file to list jars in
Groovlet	Groovy-ized servlet
GSP	Groovy-ized JSP
this.args	access command-line args
groovy.codehaus.org	Groovy home page
	memorize

edit

Question	Answer
no	are semicolons required?
yes	can semicolons be used?
yes	can groovy code use normal jars?
no in a script yes in a class	must variables be defined?
no	must method arg types be declared?
no	must exceptions be handled?
yes in a script	can code exist outside of a class
	memorize

edit

edit