//两矩阵相乘
    class Juzhen
    {
        int[][] a={{1,5,9},{8,7,6}};
        int[][] b={{1,6,7,8},{1,2,3,4},{7,8,9,10}};
        int[][] c=new int[2][4];
        public static void main(String[] args)
        {
            Juzhen jz=new Juzhen();
            jz.calc();
            System.out.println("矩阵A:");
            jz.show(jz.a);
            System.out.println("\n矩阵B:");
            jz.show(jz.b);
            System.out.println("\n矩阵C=A*B:");
            jz.show(jz.c);
        }
        void calc()
        {
            for(int i=0;i<2;i++)
                for(int j=0;j<4;j++)
                    for(int k=0;k<3;k++)
                        c[i][j]+=a[i][k]*b[k][j];
        }
        void show(int[][] x)
        {
            for(int i=0;i<x.length;i++)
            {
                for(int j=0;j<x[i].length;j++)
                    System.out.print(x[i][j]+" ");
                System.out.println();
            }
        }
    }

嘿嘿 我们用C#做过