Editing Apache Groovy (section)

===GroovyBeans, properties===
''GroovyBeans'' are Groovy's version of [[JavaBeans]]. Groovy implicitly generates getters and setters. In the following code, <code>setColor(String color)</code> and <code>getColor()</code> are implicitly generated. The last two lines, which appear to access color directly, are actually calling the implicitly generated methods.<ref name=konig38_9>König 2007, pp. 38-9</ref>
<syntaxhighlight lang="groovy">
class AGroovyBean {
  String color
}

def myGroovyBean = new AGroovyBean()

myGroovyBean.setColor('baby blue')
assert myGroovyBean.getColor() == 'baby blue'

myGroovyBean.color = 'pewter'
assert myGroovyBean.color == 'pewter'
</syntaxhighlight>

Groovy offers simple, consistent syntax for handling ''lists'' and ''maps'', reminiscent of Java's ''array'' syntax.<ref name=konig41_3>König 2007, pp. 41-3</ref>
<syntaxhighlight lang="groovy">
def movieList = ['Dersu Uzala', 'Ran', 'Seven Samurai']  // Looks like an array, but is a list
assert movieList[2] == 'Seven Samurai'
movieList[3] = 'Casablanca'  // Adds an element to the list
assert movieList.size() == 4

def monthMap = [ 'January' : 31, 'February' : 28, 'March' : 31 ]  // Declares a map
assert monthMap['March'] == 31  // Accesses an entry
monthMap['April'] = 30  // Adds an entry to the map
assert monthMap.size() == 4
</syntaxhighlight>