8.09.09

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JRuby and Java Iterators

Java Iterators in JRuby behave exactly as you’d expect them to… It’s always a pleasant surprise.

require 'java'
# Iterator
list = java.util.ArrayList.new
list.add("one")
list.add("two")
list.add("three")
list.each{ |item| puts item.upcase }
# Enumeration
jar = java.util.jar.JarFile.new("jruby.jar")
jar.entries.each{ |entry| puts entry.to_s }

C:\>jruby -v
jruby 1.3.1 (ruby 1.8.6p287) (2009-06-15 2fd6c3d) (Java HotSpot(TM) Client VM 1.
5.0_15) [x86-java]
 
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