Why does this code, written backwards, print “Hello World!”

Question

Here is some code that I found on the Internet:

class M‮{public static void main(String[]a‭){System.out.print(new char[]
{\'H\',\'e\',\'l\',\'l\',\'o\',\' \'         


        

Answer 1

This is actually because of Unicode bidirectional support.

U+202E RIGHT TO LEFT OVERRIDE
U+202D LEFT TO RIGHT OVERRIDE

So, those are some tricky characters. They are actually defined for right-to-left language support. The real code is

class M{public static void main(String[]a){System.out.print(new char[]
    {'H','e','l','l','o',' ','W','o','r','l','d','!'});}}

(got this by pasting into cmd.exe). Hope this answer helps you find out how this works.