Java Collections

[jg4545]

Hello,
Could somebody please tell me why I get an unsafe or unchecked ... warning from the compiler from this code snippet.

public static boolean includesAll(String theLetters, String aWord)
{
int i = 0;

// create a list from the characters in the string theLetters
List<Character> container = CharacterLists.asList(theLetters);
// create a list from the characters in the string aWord
List<Character> charList = CharacterLists.asList(aWord);

....
}
Using Blue Jay and SDK 5.0

Thanks