Statement type I don't recognize
In the "Object Ordering" section of the Collections trail in the tutorial, an example is provided:
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);
}
}
I'm confused about what this part means:
static final Comparator<Employee> SENIORITY_ORDER =
new Comparator<Employee>() {
public int compare(Employee e1, Employee e2) {
return e2.hireDate().compareTo(e1.hireDate());
}
};
Can anyone tell me what this code section is doing? I have looked back through more basic sections of the tutorial, and I haven't found anything that explains what this is, or what I should expect it to do.
Thanks in advance.
