（1）　　设计和编写代表矩阵的Matrix类。该类包括矩阵行列数变量int rows和int cols，矩阵数据数组double data[][]，构造方法Matrix()、Matrix(int rows,int cols)、Matrix(int rows,int cols,double data[][])，获取某元素值的方法getData(int row,int col)，设置某元素值的方法setData(int row,int col,double value)，计算两个矩阵的乘积的方法multiply(Matrix m)以及toString()等内容。

（2）　　编写测试类MatrixTest，并在该类中创建两个矩阵对象，计算其乘积。

（3）　　程序调试通过后填写实验报告。

-( 1) the design and preparation of matrix representing a class Matrix. This category includes matrix ranks number variable int rows and int cols, double data matrix data array [ ] [ ], tectonic method Matrix ( ), Matrix ( int rows, int cols ), Matrix ( int rows, int cols, double data [ ] [ ] ), to obtain an element value method of the getData ( int row, int Col ), set a certain element value method of the setData ( int row, int col, double value ), calculate the product of two matrices method for multiply ( Matrix m ) and toString ( ) etc..( 2 ) preparation of class MatrixTest, and in this class to create a two matrix object, computing the product.( 3) through debugging procedures after completing the experiment report.