Java.util.Set

Question

This is related to the iterator;
Here is a snipet of the code,
               while(alive){
                    x = input.readInt();
                    y = input.readInt();
                    size = input.readInt();
                    int h = 0;
                    if(size == -1){}
                    else{
                    while(true){
                         x1 = (int) input.readInt();
                         if(x1 == -1){
                              break;
                         y1 = (int) input.readInt();
                         bullets.add(new Integer(x1));
                         bullets.add(new Integer(y1));
                         System.out.println("Recieved Bullet At - " + x1 + ", " + y1);
                         h++;
                    main.updateAll(x, y, playerNumber, bullets );
                    System.out.println("Bullets Size On Server = " + bullets.size());
                    bullets.clear();
                    x = 0;
                    y = 0;
And then the main.updateAll() method:
Iterator i = players.iterator();
                    while(i.hasNext()){
                    io = (ServerIO) i.next();
                    if(io.playerNumber == playerNum){}
                    else{
                         io.output.writeInt(x);
                         io.output.writeInt(y);     
                         io.output.flush();
                         io.output.writeInt(1);
                         System.out.println(bullets.size() + " Sent Bullet Size");
                         io.output.flush();
                         Iterator itt = bullets.iterator();
                         while(itt.hasNext()){
                              int bx = (Integer)itt.next();
                              int by = (Integer)itt.next();
                              io.output.writeInt(bx);
                              io.output.writeInt(by);
                              io.output.flush();
                              System.out.println("Sent Bullet X Y" + bx + ", " + by);
                         io.output.writeInt(-1);
                         io.output.flush();
                    }Ok it produces this output:
Recieved Bullet At - 742, 381
2 Sent Bullet Size
Sent Bullet X Y742, 381
Bullets Size On Server = 2
0 Sent Bullet Size
Bullets Size On Server = 0
Recieved Bullet At - 741, 381
2 Sent Bullet Size
Sent Bullet X Y381, 741
As u can see 1st tym the bullets are read out of the Set the way they were put in, the second tym however they wernt? the were read from the set the oposite way? Any ideas??

Answer 1

Set makes no guarantees about iteration order.
If you want them to come out in the same order in which they were put in, use LinkedHashSet.