How to access an ArrayList in an ArrayList? Java

First let me tell you what I want to do. The program should ask for a password and then create array lists for each character of the password. These list will then be added to the overall array list.(mylist) The question is how do I then populate the ArrayLists with String values? When all the Arraylists are populated i want to be able to sort them in Alphabetical order. Code blow.

// Creating ArrayLists
ArrayList<ArrayList<String>> mylist = new ArrayList<ArrayList<String>>();
List<String> mycode = new ArrayList<String>();    
char[] test;
String mypassword;

System.out.println("Pleaseinput your passphrase");
        // Getting user input (Password)
        Scanner in = new Scanner(System.in);
        mypassword = in.nextLine();
        // Storing password in character array
        test= mypassword.toCharArray();

    // Beginning for loop to create array lists for each character
    // in the password
    for (int i = 0; i < mypassword.length(); i++) { 
            mycode = new ArrayList<String>();
            // Here I'm trying to give the created Arraylist (mycode)
            // a name or value of the character the for loop is at so I                  can order it alphabetically later.
            mycode.equals(test[i]);
            // Adds the array list.
            mylist.add((ArrayList<String>) mycode);
        }

Thanks in advance for any suggestions on my question.