public class Aufgabe4 {

  public static void main(String[] args) {
    int[][] matrixA = new int[][] {
        { 3, 2, 1 },
        { 1, 0, 2 }
    };
    int[][] matrixB = new int[][] {
        { 1, 2 },
        { 0, 1 },
        { 4, 0 }
    };

    int[][] matrixC = matrixMultiplikation(matrixA, matrixB);

    for (int i = 0; i < matrixC.length; i++)
      for (int j = 0; j < matrixC[i].length; j++)
        System.out.print(matrixC[i][j] + (j % matrixC.length == 0 ? " " : "\n"));
  }

  public static int[][] matrixMultiplikation(int[][] matrixA, int[][] matrixB) {
    int[][] matrixC = new int[matrixA.length][matrixB[0].length];

    for (int i = 0; i < matrixA.length; i++)
      for (int j = 0; j < matrixB[i].length; j++)
        for (int k = 0; k < matrixA[j].length; k++)
          matrixC[i][j] += matrixA[i][k] * matrixB[i][j];
    return matrixC;
  }

}