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 Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
• Campbell Ritchie
• Liutauras Vilda
• Ron McLeod
• Jeanne Boyarsky
• Paul Clapham
Sheriffs:
• Junilu Lacar
• Tim Cooke
Saloon Keepers:
• Carey Brown
• Stephan van Hulst
• Tim Holloway
• Peter Rooke
• Himai Minh
Bartenders:
• Piet Souris
• Mikalai Zaikin

# Arrays of Arrays

Greenhorn
Posts: 7
• Number of slices to send:
Optional 'thank-you' note:
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
• Number of slices to send:
Optional 'thank-you' note:
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:

 Consider Paul's rocket mass heater.