Java - Matriz 4x4 con bucle for y llenado con operaciones matematicas

int k = 1;

int [][] m = new int[4][4];

for (int i = 0; i < 4; i++) {

    for (int j = 0; j < 4; j++) {

        m[i][j] = k * 2;

        k++;

    }

}

//Ahora mostramos el resultado

for (int i = 0; i < m.length; i++) {

    for (int j = 0; j < m.length; j++) {

        System.out.print(m[i][j] + "\t");

    }

    System.out.println();

}

int[][] m = new int[4][4];

int i = 0;

int j = 0;

for (int k = 1; k <= (4 * 4); k++) {

    m[i][j] = k * 2;

    if(k % 4 == 0){

        j = 0;

    } else {

        j++;

    }

    if (j % 4 == 0) {

        i++;

    }

}

//Ahora mostramos el resultado

for (i = 0; i < m.length; i++) {

    for (j = 0; j < m.length; j++) {

        System.out.print(m[i][j] + "\t");

    }

    System.out.println();

}

public class Matrix4by4 {

    public static void main(String[] args) {

        int[][] m = new int[4][4];

        process(m);

        print(m);

    }

    private static void process(int[][] m) {

        int i = 0;

        int j = 0;

        for (int n = 2; n <= 32; n+=2) {

            m[i][j++] = n;

            if (n % 8 == 0) {

                i++;

                j = 0;

            }

        }

    }

    private static void print(int[][] m) {

        System.out.println();

        for (int i = 0; i < m.length; i++) {

            for (int j = 0; j < m.length; j++) {

                System.out.print(m[i][j] + "\t");

            }

            System.out.println();

        }

    }

}

public class Matrix4by4 {

    public static void main(String[] args) {

        int[][] m = new int[4][4];

        process(m);

        print(m);

    }

    private static void process(int[][] m) {

        int i = 0;

        int j = 0;

        for (int n = 1; n <= (4 * 4); ++n) {

            m[i][j++] = n * 2;

            if (n % 4 == 0) {

                i++;

                j = 0;

            }

        }

    }

    private static void print(int[][] m) {

        System.out.println();

        for (int i = 0; i < m.length; i++) {

            for (int j = 0; j < m.length; j++) {

                System.out.print(m[i][j] + "\t");

            }

            System.out.println();

        }

    }

}

// ..

    private static void process(int[][] m) {

        for (int n = 2; n <= 32; n+=2) {

            m[(n-2)/8][((n-2)/2)%4] = n;

        }

    }