Re: Error: uses unchecked or unsafe operations

Hi,

I am having a problem with the above mentioned error:
Coalesce.java uses unchecked or unsafe operations.

Now I know this is to do with generics but I am not entirely sure how
to solve the problem. Here is the code that is causing it:

List<Tree> trees = new ArrayList<Tree>();
for(int i=0;i<10;i++)
{
trees.add(coalescents.get(i).makeTree());
trees.get(i).calcLikelihood();
}
Collections.sort(trees); //this line is the problem

The problem is in the "sort" method. How can I make sure the compiler
knows that I will only be passing things of type Tree to the
Colections.sort method?