How can this Java code compile?

Question

A colleague came across some code that looked like this and couldn't understand how it could ever compile:

class FooClass {
  public static void bar(String arg) {
     System.out.println("arg = " + arg);
     http://www.google.com
     System.out.println("Done!");
  }
}

Basically, there was a random URL pasted in the middle of a method but javac didn't care.

We worked out so I'll post the answer if no-one else finds out but I thought it was interesting enough to post.

Answer 1

"http:" is interpreted as a label. What follows is an end-of-line comment.

Answer 2

You have a label

http:

followed by a comment

//www.google.com

Answer 3

Easy. The highlighting on this site shows why.

http: is a label, as in break http;

//www.google.com is a comment.

Answer 4

http: is the label. // starts the comment.