在Java中删除2D arraylist中的特定行

Question

I want to delete a specific row from 2D arraylist and that row is replaced by the next row. I wrote following code:

Collection<?> c = joint_mat.get(row); joint_mat.get(row).removeAll(c);

This code is deleting the elements of the row but not replacing it with the next row. Output is as follows:

[0.6, 0.608, 0.608, 0.628, 0.608],

[0.6, 0.6, 0.6, 0.608, 0.608],

[0.6, 0.652, 0.6, 0.612, 0.608],

[],

[0.612, 0.632, 0.608, 0.604, 0.608],

[0.6, 0.604, 0.604, 0.62, 0.62],

Answer 1

How about this:

joint_mat.remove(row);

PS an easier way to do what you are doing above, clearing the contents of the arraylist on the row, is like this:

joint_mat.get(row).clear();