This week's book giveaway is in the Cloud/Virtualization forum.
We're giving away four copies of Learning OpenStack Networking: Build a solid foundation in virtual networking technologies for OpenStack-based clouds and have James Denton on-line!
See this thread for details.
Win a copy of Learning OpenStack Networking: Build a solid foundation in virtual networking technologies for OpenStack-based clouds this week in the Cloud/Virtualization forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Liutauras Vilda
  • Campbell Ritchie
  • Tim Cooke
  • Bear Bibeault
  • Devaka Cooray
Sheriffs:
  • Jeanne Boyarsky
  • Knute Snortum
  • Junilu Lacar
Saloon Keepers:
  • Tim Moores
  • Ganesh Patekar
  • Stephan van Hulst
  • Pete Letkeman
  • Carey Brown
Bartenders:
  • Tim Holloway
  • Ron McLeod
  • Vijitha Kumara

How to print the last value of 2d array  RSS feed

 
Ranch Hand
Posts: 229
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Assuming you don't know the size of the arrays, is there a way to use .length or .size to get the final value of the 2d array? If no loop allowed either. I was just a little curious.
 
Sheriff
Posts: 3015
12
Firefox Browser IntelliJ IDE Java Mac Ruby
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
A 2d array in Java (and many other languages) is just an array of 1d arrays. If you think of it as rows and columns, then each row may have the same number of columns, but that's not necessarily true. You get the number of rows by a.length and the number of columns in the second row, for example, as a[1].length. That should be enough for you to finish your assignment.
 
Tony Smith
Ranch Hand
Posts: 229
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Yes, the original thing I got stuck in my mind was that I forgot each row has same number of columns. a[1].length == a[2].length so this will work

System.out.println(array[array.length-1][array[0].length-1]);

As picking any row will yield same amount of columns for traditional array. But you also mentioned that each row may have different columns. While I am not quite familiar with that but I think I have heard of it before. I am not sure how to initialize array like that. But I came up with the following code, it might be able to still generate the last value of the 2d array when each row may have different numbers of columns and also if the numbers of columns was not given. I guess this is what I was looking for when I first asked the question.

System.out.println(array[array.length-1][array[array.length-1].length-1]);
 
Greg Charles
Sheriff
Posts: 3015
12
Firefox Browser IntelliJ IDE Java Mac Ruby
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Yep, that looks right to me. Good work!
 
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!