Matrix Multiplication in Java

package com.learning.ds.matrices;
import com.learning.ds.arrays.ArrayUtil;

/**
 * Created by Rajdeep on 28/1/14.
 */
public class MatrixMultiplicationDemo {
    public static void main(String[] args){
        //the temp1 and temp2 array values can be changed to test this program
        int[][] temp1 = {{2,0}};
        int[][] temp2 = {{1,1,1}, {2,2,2}};

        System.out.println("Matrix 1: ");
        ArrayUtil.print2DIntArray(temp1);
        System.out.println("Matrix 2: ");
        ArrayUtil.print2DIntArray(temp2);

        if( !( isFilledMatrix(temp1) && isFilledMatrix(temp2) ) ){
            System.out.println("One of the matrices is not filled completely and can't be used for multiplication.");
        }
        else{
            //check dimension
            if(!areMatricesMultipliable(temp1, temp2)){
                System.out.println("The number of columns in first matrix is unequal to number of rows in second matrix. The must be equal for dot product.");
            }
            else{
                System.out.println("can be multiplied");
                int[][] tempNew = multiplyMatrices(temp1, temp2);
                System.out.println("new matrix is: ");
                ArrayUtil.print2DIntArray(tempNew);
            }
        }
    }

    private static int[][] multiplyMatrices(int[][] temp1, int[][] temp2) {
        //
        int rowCount1 = temp1.length;
        int colCount1 = temp1[0].length;
        int colCount2 = temp2[0].length;

        int[][] tempNew = new int[rowCount1][colCount2];

        for(int i=0; i < rowCount1; i++){
            int k=0;
            while(k < colCount2){
                int tempVal = 0;
                for (int j=0; j < colCount1; j++){
                    tempVal = tempVal + ( temp1[i][j] * temp2[j][k] );
                }
                tempNew[i][k] = tempVal;
                k++;
            }

        }

        return tempNew;
    }

    //matrix multiplication rule is
    //no of columns of left matrix == no of rows in right matrix
    // (m x n) . (n x p) = (m x p)
    private static boolean areMatricesMultipliable(int[][] mat1, int[][] mat2){
        return (mat1[0].length == mat2.length);
    }

    //check the matrix has all elements filled or not
    //In other words, checking whether number of columns in each row is same
    private static boolean isFilledMatrix(int[][] mat){
        boolean retVal = false;
        int rows = mat.length;
        
        if(rows == 1){
            retVal = true;
        }
        else {
            for(int i=0; i < (rows-1); i++){
                if(mat[i].length != mat[i+1].length){
                    retVal = false;
                    break;
                }
                else
                    retVal = true;
            }
        }

        return retVal;
    }
}

The

ArrayUtil.print2DArray(int[][] args)

prints the array on screen through normal 'for' loops.
One sample output:

Matrix 1:
2 0
Matrix 2:
1 1 1
2 2 2
can be multiplied
new matrix is:
2 2 2

Another sample output by changing the temp1 and temp2 arrays in main() method:

Matrix 1::
2 0 3:
Matrix 2::
1 1 1:
2 2 2:
One of the matrices is not filled completely and can't be used for multiplication.