Comparator to a TreeMap

Question

Hi
I insert to a TreeMap (kays,values) where the values contains a custom class.in the constructor of TreeMap I want to insert a comparator wich will sort the records by a variable of the custom class I made. How can I do it?
my custom class
public class DrawRecord {
  int id = 0;
  String date = "";
  int drawNum = 0;
  String result = "";
  String winner = "";
  public DrawRecord(String date, int drawNum, String result, String winner) {
    this.id = id;
    this.date = date;
    this.drawNum = drawNum;
    this.result = result;
    this.winner = winner;
  public int getDrawNumber() {
    return drawNum;
}the main class portion:
TreeMap treemap = TreeMap(new ItemComparator())
  treemap.add(key,value);the comperator as my question:
class ItemComparator implements Comparator {
  public int compare(Object o1, Object o2) {
      if ( ( ( ? ) o1).itemRecord.drawNum  < ( ( ? ) o2). itemRecord.drawNum  {
          return 1;
      if ( ( ( ? ) o1). itemRecord.drawNum  == ( ( ? ) o2).itemRecord.drawNum  (){
          return 0;
      return -1;
  public boolean equals(Object obj) {
      return obj instanceof ItemComparator;
}Thanks
D

Answer 1

* You can provide a Comparator that just reversesthe
order of what Date's compareTo function does.
Collections.reverseOrder() may (or may not) help you
here.
i got the idea but can i implement it by code? No, you implement it by stuffing Ricky Martin's toenail clippings up your nose while warming an egg salad sandwich under your left armpit (make sure it's the left--the right implements belly button locusts) and doing an imitation of Leonard Nimoy singing "Fat Bottomed Girls". On a Tuesday.
(dont
write for me the code just give me a way to go)Well, I haven't looked at that reverseOrder at all, but what I'd do if I were going to write my own comparator is this:
Comparator.compare takes two objects, compares them, and returns negative, zero, or positive, depending if the first object is, respectively, less than, equal to, or greater than the second.
Now, what we want is, given two Dates, d1 and d2, we want ourComparator.compare(d1, d2) to return the opposite of what d1.compareTo(d2) would.
So you cast both of compare's args to Dates, and then return the aforementioned opposite. (Actually, this would work for any Comparable, so you can just cast them to Comparable.)
Do you think you can get it from that? Because I don't know what other hints I can give you that don't basically amount to writing the code for you.
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