This. Note that Java main methods start with public static void main(String[] args){} The main method takes an array of String objects from the command line a

This. Note that Java main methods start with public static void main(String[] args){} The main method takes an array of String objects from the command line as an argument. You can't pass a boolean or anything other than a String in args any more easily in Java than you can in Ruby. But Ruby and other dynamic languages give you eval which, although dangerous, can have the effect of coercing your string into a boolean. irb(main):001:0> a = "true" => "true" irb(main):002:0> b = eval a => true irb(main):003:0> b => true irb(main):004:0> !b => false