Win a copy of Reactive Streams in Java: Concurrency with RxJava, Reactor, and Akka Streams this week in the Reactive Progamming 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:
  • Campbell Ritchie
  • Liutauras Vilda
  • Junilu Lacar
  • Jeanne Boyarsky
  • Bear Bibeault
Sheriffs:
  • Knute Snortum
  • Tim Cooke
  • Devaka Cooray
Saloon Keepers:
  • Ron McLeod
  • Stephan van Hulst
  • Tim Moores
  • Tim Holloway
  • Carey Brown
Bartenders:
  • Piet Souris
  • Frits Walraven
  • Ganesh Patekar

Arrays of Arrays

 
Greenhorn
Posts: 7
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
can anybody explain this arrrays of arrays, i am getting confused with the nested for loops,
and what should i know in arrays of arrays as am preparing for the SCJP
class arr {
public static void main (String args[]) {
int twoD[][] = new int[2][3];
int i, j, k = 0;
for(i=0; i<2; i++)
for(j=0; j<3; j++) {
twoD[i][j] = k;
k++;
System.out.println(twoD[i][j]);
}
}
}
Thank you very much
 
Author & Gold Digger
Posts: 7617
6
IntelliJ IDE Java
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
In this case we have a bi-dimensional array. It is kind of like a matrix 2x3 (2 rows - 3 columns).
int twoD[][] = new int[2][3];
The nested for loops are needed in order to access each cell of the matrix.
for(int i=0;i<2;i++) will traverse the first and second row.
for(int j=0;j<3;j++) will traverse the first, the second and the third column.
Each cell is assigned k (incremented at each iteration). The content of the bi-dimensional array after its initialization is:
 
It's fun to be me, and still legal in 9 states! Wanna see my tiny ad?
Java file APIs (DOC, XLS, PDF, and many more)
https://products.aspose.com/total/java
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!