Java 5, Collections warning in Eclipse

[colin shuker]

Hi, I'm using Java 5.0, with Eclipse.
I have this code below, which gives a warning as stated below:

Comp comp = new Comp();
Set<SetObj> set=new TreeSet<SetObj>([I]comp[/I]);
 
...
 
class Comp implements Comparator
{
    public int compare(Object o1,Object o2)
    {
    if(((SetObj)o1).x<((SetObj)o2).x) return -1;
    if(((SetObj)o1).x>((SetObj)o2).x) return 1;
return 0;
    }
}

The word comp gets underlined in yellow in eclipse, as shown above in italics, and it says:

Type safety: The expression of type Comp needs unchecked conversion to conform to Comparator<? super SetObj>

Can anyone explain what this means and how I can fix it without just supressing the warning.

Thanks
[ April 19, 2007: Message edited by: colin shuker ]

[Keith Lynn]

The reason is that you are trying to create a TreeSet with a type by using a Comparator that has a raw type.

To get rid of the warning, instead of implementing the raw interface Comparator, you can implement the interface Comparator<SetObj>.