Interacting with Networks and Databases - Beginning Java 7 - page 836

{

if (args.length != 2)
{

System.err.println("usage: java resolve baseuri

uri");

return;

}
URI uri = new URI(args[0]);
System.out.println("resolved uri =

"+uri.resolve(args[1]));
}

}

Compile Listing9-12 ( javac Resolve.java )andruntheapplicationasfollows:
java Resolve http://java.sun.com/j2se/1.3/docs/guide/col-
lections/designfaq.html#28 . You should observe the following output:
Resolved URI = http://java.sun.com/j2se/1.3/docs/guide/
collections/designfaq.html#28

Relativization
Relativization istheinverseofresolution.ForanytwonormalizedURIs,relativization
undoestheworkperformedbyresolutionandresolutionundoestheworkperformedby
relativization.
URI declares a URI relativize(URI uri) method for relativizing its uri
argument against the URI in the current URI object (on which this method was
called)— relativize() throws NullPointerException when uri is null .

Note For any two normalized URI instances u and v ,
u.relativize(u.resolve(v)).equals(v)

and

u.resolve(u.relativize(v)).equals(v) evaluate to true.

relativize() performsrelativizationofits URI argument'sURIagainsttheURI
in the URI object on which this method was called as follows:
• IfeitherthisURIortheargumentURIisopaque,oriftheschemeandauthority
components of the two URIs aren't identical, or if the path of this URI isn't a
prefix of the path of the argument URI, the argument URI is returned.