matrix multiplication in java using function

1public class Matrix {
2  private double[][] multiply(double[][] matrixOne, double[][] matrixTwo) {
3            assert matrixOne[0].length == matrixTwo.length: "width of matrix one must be equal to height of matrix two";
4            double[][] product = new double[matrixOne.length][matrixTwo[0].length];
5    		//fills output matrix with 0's
6            for(short l = 0; l<matrixOne.length; l++) {
7                for(short m = 0; m<matrixTwo[0].length; m++) {
8                    product[l][m] = 0;
9                }
10            }
11    		//takes the dot product of the rows and columns and adds them to output matrix
12            for(short i = 0; i<matrixOne.length; i++) {
13                for(short j = 0; j<matrixTwo[0].length; j++) {
14                    for(short k = 0; k<matrixOne[0].length; k++) {
15                        product[i][j] += matrixOne[i][k] * matrixTwo[k][j];
16                    }
17                }
18            }
19            return product;
20        }
21}

1    public class MatrixMultiplicationExample{  
2    public static void main(String args[]){  
3    //creating two matrices    
4    int a[][]={{1,1,1},{2,2,2},{3,3,3}};    
5    int b[][]={{1,1,1},{2,2,2},{3,3,3}};    
6        
7    //creating another matrix to store the multiplication of two matrices    
8    int c[][]=new int[3][3];  //3 rows and 3 columns  
9        
10    //multiplying and printing multiplication of 2 matrices    
11    for(int i=0;i<3;i++){    
12    for(int j=0;j<3;j++){    
13    c[i][j]=0;      
14    for(int k=0;k<3;k++)      
15    {      
16    c[i][j]+=a[i][k]*b[k][j];      
17    }//end of k loop  
18    System.out.print(c[i][j]+" ");  //printing matrix element  
19    }//end of j loop  
20    System.out.println();//new line    
21    }    
22    }}  

1// matrix multiplication java
2public class MatrixMultiplicationJavaDemo 
3{
4   public static int[][] multiplyMatrix(int[][] matrix1, int[][] matrix2, int row, int column, int col)
5   {
6      int[][] multiply = new int[row][col];
7      for(int a = 0; a < row; a++) 
8      {
9         for(int b = 0; b < col; b++) 
10         {
11            for(int k = 0; k < column; k++) 
12            {
13               multiply[a][b] += matrix1[a][k] * matrix2[k][b];
14            }
15         }
16      }
17      return multiply;
18   }
19   public static void printMatrix(int[][] multiply) 
20   {
21      System.out.println("Multiplication of two matrices: ");
22      for(int[] row : multiply) 
23      {
24         for(int column : row) 
25         {
26            System.out.print(column + "    ");
27         }
28         System.out.println();
29      }
30   }
31   public static void main(String[] args) 
32   {
33      int row = 2, col = 3;
34      int column = 2;
35      int[][] matrixOne = {{1, 2, 3}, {4, 5, 6}};
36      int[][] matrixTwo = {{7, 8}, {9, 1}, {2, 3}};
37      int[][] product = multiplyMatrix(matrixOne, matrixTwo, row, col, column);
38      printMatrix(product);
39   }
40}