There are two good ways to copy array is to use clone and System.arraycopy()
.
Here is how to use clone for 2D case:
int [][] myInt = new int[matrix.length][]; for(int i = 0; i < matrix.length; i++) myInt[i] = matrix[i].clone();
For System.arraycopy(), you use:
int [][] myInt = new int[matrix.length][]; for(int i = 0; i < matrix.length; i++) { int[] aMatrix = matrix[i]; int aLength = aMatrix.length; myInt[i] = new int[aLength]; System.arraycopy(aMatrix, 0, myInt[i], 0, aLength); }
I don’t have a benchmark but I can bet with my 2 cents that they are faster and less mistake-prone than doing it yourself. Especially, System.arraycopy()
as it is implemented in native code.
Hope this helps.
Edit: fixed bug.
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