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Element in arraylist of arraylists

Posted on 2013-11-19
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Last Modified: 2013-11-19
Working in Java, how do I address a specific item in an array list of arraylists?

I have the constructor:
ArrayList<ArrayList<Integer>> testpaths = new ArrayList<ArrayList<Integer>>();

Which when I print to console:
System.out.println(testpaths + "\n");

Output after running some method() is:
[[], [1], [2], [1, 5, 3], [2, 4], [1, 5], [1, 5, 6], [1, 5, 7]]

Let's say that in that 8th item [1,5,7] - I just want the "1".

Thanks!
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Question by:Geisrud
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jb1dev earned 500 total points
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testpaths.get(7).get(0);
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by:jb1dev
ID: 39661112
The above should work fine provided you have the generics in place, as you do in your example. If you did not have the generics in place, you would need to cast the first get() result back as an ArrayList.

E.g.
((ArrayList)testpaths.get(7)).get(0);
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