関連ワード:  how to declare 2d vector in java    how to declare 2d matrix in java    how to create 2d matrix in java    how to initialize 2d matrix in java    how to define 2d matrix in java    how to create a 2d vector in java    how to create a 2d matrix in javascript    how to declare size of 2d vector in c++    how to declare 2d vector in c++    how to declare vector in java