Conflicts between Java .net.URL and Java .net.URI when dealing with hostname contains underscore( ), is it a bug?

[tl3shi]

REF link

java.net.URL url = new java.net.URL("http://test_1.tanglei.name");
System.out.println(url.getHost()); //test_1.tanglei.name
java.net.URI uri = new java.net.URI("http://test_1.tanglei.name");
System.out.println(uri.getHost()); //null