The number of backlog in ServerSocket(int port, int backlog) Constructor is explained
simply as follows.

" Parameters:
    port - the specified port, or 0 to use any free port.
    backlog - the maximum length of the queue."

http://java.sun.com/j2se/1.4.2/docs/api/index.html
http://java.sun.com/j2se/1.5.0/docs/api/index.html

However, even if we specify preferable number as the number of backlog ,
actual number depends on underlying Opreationg System.

The documnet should say the below(just example).
 "Parameters:
    port - the specified port, or 0 to use any free port.
    backlog - Request of size of the backlog is just passed to underlying OS.
              How the OS performs with the request depends on each OS."

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