Here's a basic Java code using jsoup to retrieve all the links in a website:

import java.io.IOException;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class ExtractLinks {
  public static void main(String[] args) {
    try {
      // Connect to the website
      Document document = Jsoup.connect("https://www.example.com").get();

      // Select all the links from the page
      Elements links = document.select("a[href]");

      // Iterate through the links and print their URLs
      for (Element link : links) {
        System.out.println(link.attr("abs:href"));
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}

In this code, we are connecting to the website "https://www.example.com" and retrieving its HTML content using the Jsoup.connect and get methods. The select method is then used to select all the links in the page that have an "href" attribute. Finally, we iterate through the links using a for loop and print the URLs of each link using the attr method.
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