JRubyJava型変換
Array<=>java.util.ArrayList
#Array -> java.util..ArrayList ruby_ary = [1,2,3] java_ary = java.util.Arrays.as_list(ruby_ary.to_java) puts java_aray.class.to_s #java.util.ArrayList -> Array java_ary = java.util.ArrayList.new java_ary.add(1) java_ary.add(2) java_ary.add(3) ruby_ary = java_ary.to_a puts ruby_ary.class