Array reflection and two dimensional array : Array « Reflection « Java Tutorial

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2. Reflection
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import static java.lang.System.out;

import java.lang.reflect.Array;

public class CreateMatrix {
  public static void main(String... args) {
    Object matrix = Array.newInstance(int.class, 2, 2);
    Object row0 = Array.get(matrix, 0);
    Object row1 = Array.get(matrix, 1);

    Array.setInt(row0, 0, 1);
    Array.setInt(row0, 1, 2);
    Array.setInt(row1, 0, 3);
    Array.setInt(row1, 1, 4);

    for (int i = 0; i < 2; i++)
      for (int j = 0; j < 2; j++)
        out.format("matrix[%d][%d] = %d%n", i, j, ((int[][]) matrix)[i][j]);
  }
}