利用Java实现的图的不同表示方法的转换器，从文件读入一个有向图的权矩阵表示(含有矩阵阶数)，输出这个图的关联矩阵、边列表、逆向表、邻接表表示。可作为图论的学习材料。-Using Java to achieve different graph representation of the converter, the file is read from a directed graph represents the weight matrix (containing a matrix of ord