How to get parent URL in Java?

Question

In Objective-C I use -[NSURL URLByDeletingLastPathComponent] to get parent URL. What\'s the equivalent of this in Java?

Answer 1

I don't know of library function to do this in one step. However, the following (admittedly cumbersome) bit of code I believe accomplishes what you're after (and you could wrap this up in your own utility function):

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;

public class URLTest
{
    public static void main( String[] args ) throws MalformedURLException
    {
        // make a test url
        URL url = new URL( "http://stackoverflow.com/questions/10159186/how-to-get-parent-url-in-java" );

        // represent the path portion of the URL as a file
        File file = new File( url.getPath( ) );

        // get the parent of the file
        String parentPath = file.getParent( );

        // construct a new url with the parent path
        URL parentUrl = new URL( url.getProtocol( ), url.getHost( ), url.getPort( ), parentPath );

        System.out.println( "Child: " + url );
        System.out.println( "Parent: " + parentUrl );
    }
}