関連ワード:  how to use 2d arraylist in java    how to access 2d arraylist in java    how to access multidimensional arraylist in java    how to access 2d arraylist elements in java    how to create 2d arraylist in java    how to initialize 2d arraylist in java    how to declare 2d arraylist in java    how to sort 2d arraylist in java    how to print 2d arraylist in java    how to traverse 2d arraylist in java