object Main { def main(args: Array[String]) { val sites = Map("w3xue" -> "www.w3xue.com", "google" -> "www.google.com") println("sites.get( \"w3xue\" ) : " + sites.get( "w3xue" )) // Some(www.w3xue.com) println("sites.get( \"baidu\" ) : " + sites.get( "baidu" )) // None } }