//DateComparatorJulian.java
//continuing the example from DateComparator.java
//example of another meaning of comparison.

import java.util.*;

//***this comparator compares Dates by julian day within the year.
//i.e. year is ignored.
public class DateComparatorJulian implements Comparator {

    //must be this signature:
    //return 0 if equal, positive if a>b, negative if a<b
    public int compare(Object a, Object b) {
	//cast the parameters to Dates:
	Date d1 = (Date) a;
	Date d2 = (Date) b;

	if (d1.getMonth() > d2.getMonth())
	    return 1;
	else if (d1.getMonth() < d2.getMonth())
	    return -1;
	else if (d1.getDay() > d2.getDay())
	    return 1;
	else if (d1.getDay() < d2.getDay())
	    return -1;
	else 
	    return 0;
    }
}