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Need Help - Sorting an ArrayList of Strings

K Bala

Joined: Jul 14, 2005
Posts: 28
I have an ArrayList of Strings like this

"132 8"
"132 12"
"132 4"
"132 19"

When I sort it using Collections.sort() method, I get

132 12
132 19
132 4
132 8

I want the ArrayList to be sorted like this

132 4
132 8
132 12
132 19

How can I achieve this? Please help

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Rob Spoor

Joined: Oct 27, 2005
Posts: 20077

You'll need a custom comparator that, when comparing, splits the strings based on the space (hint: String.split), then converts the array elements to Integers (or Longs, depending on the length), and then compares these.

As for the comparing of the Integers, you'll need to compare the separate parts. Something like this:

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