A value retrieved from a type-specific collection does not need to be casted : Map « Collections « Java Tutorial

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2. Collections
3. Map

import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

public class Main {
  public static void main(String[] argv) {

    Map<String, URL> urlMap = new HashMap<String, URL>();
    try {
      urlMap.put("java", new URL("http://www.java2s.com"));
    } catch (MalformedURLException e) {
    }
    String s = urlMap.get("java").getHost();
  }
}