如何添加到二维ArrayList的索引

Question

Can anyone tell me how to add a new item to an index of a 2 dimensional ArrayList. The links click here do not resolve my problem.

My code to add was the following:

wq.get(donsay).set(wq.get(donsay).size(), sil5);

which causes the following exception =>

java.lang.RuntimeException: Unable to start activity ComponentInfo{chessactivesekizsatirvetekliarray.com.sekizsatirvetekliarray/chessactivesekizsatirvetekliarray.com.sekizsatirvetekliarray.MainActivity}: java.lang.StringIndexOutOfBoundsException: length=2; index=3

Thank you all in advance...

Answer 1

set() method of ArrayList expects an index less than size. Use add() method instead:

wq.get(donsay).add(wq.get(donsay).size(), sil5);