public class Matrix {
    private int x;
    private double[][] table;
    public Matrix(int x, double[][] xs) {
        table = new double[x][x];
        for (int i = 0; i < x; i++) {
            for (int j = 0; j < x; j++) {
                this.table[i][j] = xs[i][j];
            }
        }
    }
    public double elem(Matrix a) {
        return table[0][0];
    }
}


public class Test {
    public static void main(String[] args) {
        double[][] arr = new double[][] {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
        Matrix a = new Matrix(3, arr);
        double s;
        s = Matrix.elem(a);
        System.out.println(s);
    }
}