I am having trouble with this exercise, please help. I have to use the printf method. This for Java

Programming Exercise 8.6 (Algebra: multiply two matrices) Write a method to multiply two matrices. The header of the method is: public static double[][] multiplyMatrix(double[]]] a, double[][] b) To multiply matrix a by matrix b, the number of columns in a must be the same as the number of rows in b, and the two matrices must have elements of the same or compatible types. Let c be the result of the multiplication. Assume the column size of matrix a is n. Each element cij is ai1 b1j+ai2b2j+c+ ain * bnj. For example, for two 33 matrices a and b, c is a11a21a31a12a22a32a13a23a33b11b21b31b12b22b32b13b23b33=c11c21c31c12c22c32c13c23c33 where cij=ai1b1j+ai2b2j+ai3b3j. Write a test program that prompts the user to enter two 3 3 matrices and displays their product. Here is a sample run