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Also, the ListNodes you're passing as parameters should have their data types. I think that you said they were both Integer.


public static ListNode<Integer> insertBeforeSmallest...

(String)prevNodeMain.getValue ()

If you're using Integers,

prevNodeMain.getValue().toString() would be better.

I don't think the way you have it now will work.

int length = Length (prevNodeMain);

I don't see what this is for.

Usually you look at the size of the entire list, not a just a single Node.

Unless Length is another method in the class that...

ListNode<Integer> start as your ListNode stores Integers.