show_exception.rb

begin
  #raise Exception
  String.send(:bar)
rescue Exception => e
  puts "rescue  Exception"
  puts "[Exception class: #{e.class}] [message: #{e.message}] [backtrace: #{e.backtrace}]"
  # puts e.class
  # puts e.message
  # puts e.backtrace
  # puts e.methods
  # p e
end