In an ArrayList of Strings

Question

I want to duplicate/two copies each of any string that contains the letter 'l' .
How shall i do that.
My problem here is when i add the string i dont know how to update the index of the arraylist.
https://code.sololearn.com/cPX0Sm23dCa9/?ref=app

Answer 1

Where do you want to store the new copy of your string:
1) right next to the original string? or
2) at the end of the ArrayList?

Answer 2

The add method of the ArrayList class has another form. You can specify the index where you want to add the item by passing an integer as its first argument:

list.add(i,s); //this inserts s at index i

stephen haokip Also follow Sandra's advice whenever it's possible.

Answer 3

It's in general not a good idea to modify a list while iterating over it. What's the problem now for you? This loop already adds the copies as you wanted to, or did you want something different?

Answer 4

Kevin next to original

Answer 5

Thanks any way
I figure it out

Answer 6

Sandra Meyer
Original list - rose, lips, keel
Output list should be - rose, lips, lips, keel, keel
Two copies of any string containing the letter 'l'
Plis any advice