Matrix multiplication

/* Java programme to multiply mattrix*/
package Matrix;
import java.util.Scanner;
public class Matrix1
{
    public static void main(String[] args)
    {

        int r1, c1, r2, c2, i=0, j=0, k;
        int[][] a=new int[10][10];
        int[][] b=new int[10][10];
        Scanner myobject = new Scanner(System.in);
        System.out.println("Enter rows and column for first matrix: ");
        r1=myobject.nextInt();
        c1=myobject.nextInt();
        System.out.println("Enter rows and column for second matrix: ");
        r2=myobject.nextInt();
        c2=myobject.nextInt();
        int[][] mult=new int[r1][c2];
        /* If colum of first matrix in not equal to row of second matrix, asking user to enter the size of matrix again. */
        while (c1!=r2)
        {
            System.out.println("Error! column of first matrix not equal to row of second.\n\n");
            System.out.println("Enter rows and column for first matrix: ");
            r1=myobject.nextInt();
            c1=myobject.nextInt();
            System.out.println("Enter rows and column for second matrix: ");
            r2=myobject.nextInt();
            c2=myobject.nextInt();
        }
        /* Storing elements of first matrix. */
        System.out.println("Enter elements of matrix 1:");
        for(i=0; i<r1; ++i)
        {
            for(j=0; j<c1; ++j)
            {
                System.out.println("Enter elements"+" a["+(i+1)+"]["+(j+1)+"]: ");
                a[i][j]=myobject.nextInt();
            }
        }

        /* Storing elements of second matrix. */
        System.out.println("\nEnter elements of matrix 2 : ");
        for(i=0; i<r2; ++i)
        {
            for(j=0; j<c2; ++j)
            {
                System.out.println("Enter elements"+" b["+(i+1)+"]["+(j+1)+"]: ");
                b[i][j]=myobject.nextInt();
            }
        }
        /*Initializing elements of matrix mult to 0.*/
        for(i=0; i<r1; ++i)
        {
            for(j=0; j<c2; ++j)
            {
                mult[i][j]=0;
            }
        }

        /* Multiplying matrix a and b and storing in array mult. */
        for(i=0; i<r1; ++i)
        {
            for(j=0; j<c2; ++j)
            {
                for(k=0; k<c1; ++k)
                {
                    mult[i][j]+=a[i][k]*b[k][j];
                }
            }
        }
        /* Displaying the multiplication of two matrix. */
        System.out.println("\nOutput Matrix:\n");
        for(i=0; i<r1; ++i)
        {
            for(j=0; j<c2; ++j)
            {
                System.out.println("  "+mult[i][j]);
                if(j==c2-1)
                {
                    System.out.println("\n\n");
                }
            }
        }
    }
}