Search strings on google through Java and submit

I'm trying to make a program that submits a search query to Google and then opens the browser with the results.
I have managed to connect to Google but I'm stuck because I don't know how to insert the search query into the URL and submit it.
I have tried to use HtmlUnit but it doesn't seem to work.

This is the code so far:

URL url = new URL("http://google.com");
HttpURLConnection hr = (HttpURLConnection) url.openConnection();
System.out.println(hr.getResponseCode());
String str = "search from java!";

You can use the Java.net package to browse the internet. I have used an additional method to create the search query for google to replace the spaces with %20 for the URL address

public static void main(String[] args)  {
    URI uri= null;
    String googleUrl = "https://www.google.com/search?q=";
    String searchQuery = createQuery("search from Java!");
    String query = googleUrl + searchQuery;

    try {
        uri = new URI(query);
        Desktop.getDesktop().browse(uri);
    } catch (IOException | URISyntaxException e) {
        e.printStackTrace();
    }
}

private static String createQuery(String query) {
    query = query.replaceAll(" ", "%20");
    return query;
}

The packages used are core java:

import java.awt.Desktop;
import java.net.URI;
import java.net.URISyntaxException;