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

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Java Tutorial » Collections » Map 
9. 25. 7. A value retrieved from a type-specific collection does not need to be casted
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.java2java.com"));
    catch (MalformedURLException e) {
    }
    String s = urlMap.get("java").getHost();
  }
}
9. 25. Map
9. 25. 1. Creating and storing arrays in a map
9. 25. 2. Sort based on the values
9. 25. 3. Get a key from value with an HashMap
9. 25. 4. Retrieve environment variables (JDK1.5)
9. 25. 5. Creating a Type-Specific Map: creates a map whose keys are Integer objects and values are String objects.
9. 25. 6. A map declared to hold objects of a type T can also hold objects that extend from T
9. 25. 7. A value retrieved from a type-specific collection does not need to be casted
9. 25. 8. Map techniques.
9. 25. 9. Create an array containing the keys in a map
9. 25. 10. Create an array containing the values in a map
9. 25. 11. Creating a Hash Table
9. 25. 12. Creating a Map That Retains Order-of-Insertion
9. 25. 13. Automatically Removing an Unreferenced Element from a Hash Table
9. 25. 14. Creating a Type-Specific Map [5.0]
9. 25. 15. Create type specific collections
9. 25. 16. Convert Properties into Map
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