How do I randomly pick any ArrayList index?

807603 Feb 10, 2008 4:27 PM

Hi,

My problem is that, I have an ArrayList with a number of entries in.. Each iteration that this ArrayList is read the ArrayList index should decrease by 1.

What I am trying to do though is randomly select an index within the ArrayList to get a value from.

Would I use Java's random function to generate a random number according to the size of the ArrayList.

Thus given me a random index..?

1. Re: How do I randomly pick any ArrayList index?

796254 Feb 10, 2008 4:34 PM (in response to 807603)
yes. %

Random random = new Random(); List list = new ArrayList(); int index = random.nextInt(list.length());
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2. Re: How do I randomly pick any ArrayList index?

807603 Feb 10, 2008 4:34 PM (in response to 807603)

You could've tried it in the time it took you to post the question, though!
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3. Re: How do I randomly pick any ArrayList index?

807603 Feb 10, 2008 4:36 PM (in response to 807603)

Yeah I know just like checking though with the "Experts"
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4. Re: How do I randomly pick any ArrayList index?

796254 Feb 10, 2008 4:39 PM (in response to 807603)

Yeah I know just like checking though with the "Experts"
do you ask your mom, too?

why not just try it?

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5. Re: How do I randomly pick any ArrayList index?

807603 Feb 10, 2008 4:41 PM (in response to 807603)

ChrisUK wrote:
Yeah I know just like checking though with the "Experts"
As someone once said to me, about something completely different, and in a wholly unrelated industry: be bolder, young man

He was spot on, too
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6. Re: How do I randomly pick any ArrayList index?

807603 Feb 10, 2008 4:42 PM (in response to 796254)

ha ha ha good one... I will ask her next time ;)
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