import java.net.URL;

public class UrlDemo {
    public static void main(String[] argv) throws Exception {
        URL u1 = new URL("file", null, "path");
        URL u2 = new URL("file", "", "path");
        URL u3 = new URL("file", "localhost", "path");
        System.out.println("u1 equals u3: " + (u1.equals(u3)));
        System.out.println("u2 equals u3: " + (u2.equals(u3)));
        System.out.println("u1 equals u2: " + (u1.equals(u2)));
    }
}