Sort String "13,5,8,4,2,1,9" in ascending order 1,2,4,5,8,9,13 in Java

Question

How can I sort a string "13,5,8,4,2,1,9" in ascending order, to get 1,2,4,5,8,9,13?

Answer 1

• Split the string by commas
• Parse each substring into an integer
• Sort the resulting collection
• If you need the result to be a string (it's not clear), convert each integer back into a string and join them together with commas.

If any of those steps causes you difficulties, please be more specific.

Answer 2

1. Split it into an array of items with String.split().
2. Convert to an array of numbers with Integer.valueOf().
3. Sort the array.
4. Concatenate it all back into a StringBuilder.