[Java] Multiply elements of an array

Hello. As the title says, I'm making a class that could Multiply the elements of an array capturing from the Keyboard. I've mostly done (so I think) but I got 3 problems that are giving me a headache.

Here's the code.

Code:

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import java.io.*;

public class Array{
//Implements methods for multiplying elements in an array
//Ronnye Gutierréz - 2011

        private static float[][] M1; //Array 1
        private static float[][] M2; //Array 2
        private static float[][] R; //Resulting Array
        private static int N = 2; //Order of Arrays

        public static void main(String args[]) throws IOException{
        M1 = new float[N][N];
        M2 = new float[N][N];
        R = new float[N][N];

        System.out.print("Capture of values\n");
        System.out.print("Values for Array 1\n");
        (M1);
        System.out.print("\nValues for Array 2\n");
        EnterData(M2);
        System.out.println("Capture complete");
        System.out.print("\nArray 1:\n");
        Print(M1);
        System.out.print("\nArray 2:\n");
        Print(M2);
        Multiply();
        System.out.print("\nResulting Array:\n");
        Print(R);
        System.out.println();
}

//Method to load the data into arrays
        public static void IngresaDatos(float m[][]) throws IOException{
        String cad; //To store keyboard capture

//Set LeeBuf to capture Keyboard
        BufferedReader LeeBuf = new BufferedReader(new InputStreamReader(System.in));

//Fill array
        for(int i = 0; i < N; i++)
                for(int j = 0; j < N; j++){
                        System.out.print("Enter Value [" + (i + 1) + "," + (j + 1) + "]: ");
                        cad = LeeBuf.readLine(); //Read line and stores it in cad
                        m[j] = Float.parseFloat(cad); //Convert cad to float and store it in m[i, j]
                } //Close for
} //Close EnterData


//Method which calculates the multiplication of two matrices
        public static void Multiply()
{
        float sum;
        for(int i = 0; i < N; i++){ //Start cycle lines
                for(int j = 0; j < N; j++){ //Start cycle columns
                        sum = 0;
                                for(int k = 0; k < N; k++){ //Cycle internal for summations
                                        sum += M1[k] * M2[k][j];
                                }
                                R[j] = sum;
                        }
                }
        }

        public static void Imprime(float m[][])
        {
                for(int i = 0; i < N; i++){
                        for(int j = 0; j < N; j++){
                                System.out.print(m[j] + " ");
                        }
                System.out.print("\n");
                }
        }
}//Fin clase Matriz

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And here are the lines & errors.

Code:

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m[j] = Float.parseFloat(cad)
Type mismatch: cannot conver from fload to fload[]

sum += M1[k] * M2[k][j];
The operator * is undefined for th eargument type(s) float[], float

R[j] = sum;
Type mismatch: cannot conver from fload to fload[]

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I would appreciate it if someone could help me. I'm sorry if I'm asking a lot, but I have nothing to lose.

You're trying to assign a float value to a member of a jagged array, which is an array. You need to provide both indices, not just one.

ie. m[i][j] = blah; instead of m[i] = blah;

The same goes for the multiplication issue... You can't multiply a value by an array.