How do you pick a random string from a list in java?

I'm sort of new to programming and I may be trying to run before i can walk but basically I have a list of strings and at the end of each printed line I'd like to randomly select one of the strings. I did this and it did pick a random string but the problem is every time it's used in the program it sticks to that one random string.

    String items[] = {"bla bla", "asdnoaisd", "anafgsfsan"};
            int amount;
            String list;
            Random r = new Random();

    amount = (int) (Math.random()*25+1);

    list = items[r.nextInt(12)];

help would be appreciated

UPDATE - so I probably worded this wrong. the problem isn't getting a random string but I need it to reset after every time it's used, so after it's used once it should reset and pick another string from the list.