how to return Comparator values
- From: Thufir <hawat.thufir@xxxxxxxxx>
- Date: Sat, 26 Apr 2008 15:51:20 -0700 (PDT)
Just trying to learn how Comparator works.
Looking at:
import java.util.*;
public class EmpSort {
static final Comparator<Employee> SENIORITY_ORDER =
new Comparator<Employee>() {
public int compare(Employee e1, Employee e2) {
return e2.hireDate().compareTo(e1.hireDate());
}
};
// Employee database
static final Collection<Employee> employees = ... ;
public static void main(String[] args) {
List<Employee>e = new ArrayList<Employee>(employees);
Collections.sort(e, SENIORITY_ORDER);
System.out.println(e);
}
}
http://java.sun.com/docs/books/tutorial/collections/interfaces/order.html
I like the line:
Collections.sort(e, SENIORITY_ORDER); //this will sort the collection
"e" by //SENIORITY_ORDER?
However, how or where is SENIORITY_ORDER ranking defined? I guess
it's in
return e2.hireDate().compareTo(e1.hireDate()); //neg, zero, pos
which returns either a negative, positive or zero. We're only
interested in negative results?
I had a specific question, but sorta answered it while writing it...
anyhow.
-Thufir
.
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