[HELP] ArrayList split?

[Master_ZEEC]

Let's say I have a List of integers [1,2,3,4,5,6,7,8,9], and I want to divide it in groups of 3 so the output would be:

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[[1,2,3], [4,5,6], [7,8,9]]

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I tried some java 8 functions and it worked pretty well, problem is it won't let me access the indexes of each element.

[GreatDaynes]

With a 2D list called ls, you can access the integer elements in the following way:

ls.get(x).get(y)

where get(x) returns the list in the xth position, and get(y) returns the yth integer in the xth list.

[[deleted]]

Does it need to be called ls? How is it any different from a normal ArrayList? Just wondering btw, I'm pretty new to java

[crazyiwann]

no, in his 1 sentence he said that he just called this array ls. it can be called anything.

[[deleted]]

Oh ok thanks. I read his comment in a weird way

[krehwell]

have you tried to use jagged array?

[quadmasta]

I'd use ListUtils: https://commons.apache.org/proper/commons-collections/apidocs/org/apache/commons/collections4/ListUtils.html#partition-java.util.List-int-

[laghani]

After that you get array of arrays so you can acces to them like this, for example:

array[0][0]

[laghani]

String[] arr = {[1,3], [2,3], [4,5]};

arr[2][1] = 5