System.arraycopy (2 dim array) and growth of 2 dim array

Question

Hi everybody
I am working on a program which contains a module that can perform Cartesian product on number of sets.
The code I have developed so far is :
import java.lang.reflect.Array;
public class Cart5 {
public static void main(String[] args) throws Exception
int pubnewlength;
// declare SolArray
int[][] solArray;
// initialize solArray
solArray=new int[1][4];
// Use for method
for (int ii=0 ; ii<4 ; ii++)
solver(solArray,ii);
// Print the array ?
System.out.println("\n  The array was changed ... " );
}  // End main
public void solver(int Solarray2[][] , int abi)
int[][]  A  =  {  {1,2,3,5},
                  {4,6,7},
                  {11,22,9,10},
                  {17,33}
  jointwoArrays(solarray2,A,abi);
// some other operations
} // End Solver method
public void jointwoArrays(int solarray3[][] , int aArray[][],int indexA)
int y,u;
int[][] tempArray;
// calculate growth of rows:
pubnewlength=solArray3.length * aArray[indexA].length;
//Fill TempArray
y=solArray3[0].length;
u=solArray3.length;
tempArray=new int[u][y];
// Use system.arraycopy to copy solArray3 into tempArray -- How ?
// Change the size of arrow to proper size -- How ?
solArray3 = (int[][]) arrayGrow(solArray3);
// Join operation - Still under construction
for(int i = 0, k = 0; i < tempArray.length; i++)
               for(int j = 0; j < set3.length; j++)
                                 for (q=0;q<=2;q++)             
                                  { solArray3[k][q] = tempArray[i][q];}
                                 solArray3[k][q]= aArray[indexA][j];
                                 ++k;
} // End jointwoArrays method
// This module is from http://www.java2s.com/ExampleCode/Language-Basics/Growarray.htm
    static Object arrayGrow(Object a) {
    Class cl = a.getClass();
    if (!cl.isArray())
      return null;
    Class componentType = a.getClass().getComponentType();
    int length = Array.getLength(a);
    int newLength = pubnewlength;
    Object newArray = Array.newInstance(componentType, newLength);
    System.arraycopy(a, 0, newArray, 0, length);
    return newArray;
} // End ClassI deeply appreciate your help with these 3 questions :
1. How can I use system.arraycopy to copy my two dimensional array? I have searched but examples seem to be about one dim arrays.
2. How can I change the "static Object arrayGrow(Object a)" , to grow my two dimensional array ?
3. If you know any codes or articles or java code regarding cartesian products , please tell me.
Thank you
Denis

Answer 1

1. How can I use system.arraycopy to copy my two
dimensional array? I have searched but examples seem
to be about one dim arrays.That's because you can't do it in one call. You need to create a loop which copies each 'row".
>
2. How can I change the "static Object
arrayGrow(Object a)" , to grow my two dimensional
array ?Why do you make it so complicated (generic). Make it take an int[][] array instead, and see the answer from above.
>
3. If you know any codes or articles or java code
regarding cartesian products , please tell me.There are probably lots of them if you google.
Kaj