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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