jQuery in Action, 3rd edition
The moose likes Beginning Java and the fly likes size of 2D array Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "size of 2D array" Watch "size of 2D array" New topic

size of 2D array

Alex Kravets
Ranch Hand

Joined: Jan 24, 2001
Posts: 476
Hi guys,
How can I find out length of a 2d array that I get as a parameter of a function?
If I have:
public void getArray(String[][] arr){
How can I find out what is the size of each dimension just by knowing from getArray() that this is a two-dimensional array?

All right brain, you don't like me and I don't like you, but let's just do this one thing so I can get back to killing you with beer.<br /> <br />- Homer Simpson
Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24199

Hi Alex,
A Java 2D array is really a 1D array of 1D arrays -- i.e., there's a "backbone" array whose elements are 1D arrays, whose elements are (in your example) Strings. So if the array variable is named "arr", then "arr.length" is one dimension, the length of the backbone. The other dimension can technically be different for every element of the backbone -- the array doesn't have to be "rectangular," it can be "ragged." But if you know that it is rectangular, then the other dimension is just "arr[0].length".

[Jess in Action][AskingGoodQuestions]
Alex Kravets
Ranch Hand

Joined: Jan 24, 2001
Posts: 476
I agree. Here's the link: http://aspose.com/file-tools
subject: size of 2D array
It's not a secret anymore!