[Last Call] Learn about multicloud storage options and how to improve your company's cloud strategy. Register Now

x
?
Solved

Element in arraylist of arraylists

Posted on 2013-11-19
2
Medium Priority
?
287 Views
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!
0
Comment
Question by:Geisrud
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
2 Comments
 
LVL 14

Accepted Solution

by:
jb1dev earned 2000 total points
ID: 39661102
testpaths.get(7).get(0);
0
 
LVL 14

Expert Comment

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);
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article is meant to give a basic understanding of how to use R Sweave as a way to merge LaTeX and R code seamlessly into one presentable document.
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

650 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question