Array List Sorting

I need to sort my arraylist which has some java bean objects.I tried Collections.sort() to do so.But I could not.
Is there any way to do so?

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Originally Posted by makpandian

I need to sort my arraylist which has some java bean objects.I tried Collections.sort() to do so.But I could not.
Is there any way to do so?

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Do your beans implement the Comparable<T> interface? (as stated by the API documentation of the Collections.sort( ... ) method).

kind regards,

Jos

I did not.Is the reason for that issue?

Quote:

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Originally Posted by makpandian

I did not.Is the reason for that issue?

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You bet; how else is that sorting method supposed to check if a < b or b < a?
It needs to compare the objects in the collection so these objects need to be comparable.

kind regards,

Jos

Check this out. ;)

http://www.java-forums.org/java-tuto...s-sorting.html

If you don't want the class to have to implement Comparable you create a Comparator<T> object and use this in the Collections.sort(...) overload that takes a Comparable as the second parameter.