You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: java.net.rb
    path of file: ./repos/jruby/core/src/main/ruby/jruby/java/java_ext
    
    the code of the file until where you have to start completion: # NOTE: these Ruby extensions were moved to native code!
# - **org.jruby.javasupport.ext.JavaNet.java**
# this file is no longer loaded but is kept to provide doc stubs

# *java.net.URL* extensions.
# @note Only explicit (or customized) R
    
  def open(&block)
    # stub implemented in org.jruby.javasupport.ext.JavaNet.java
    # stream = openStream
    # io = stream.to_io
    # if block
    #   begin
    #     block.call(io)
    #   ensure
    #     stream.close
    #   end
    # else
    #   io
    # end
  end