java iterator复制,用Java克隆Iterator？

In a game I have a list of players, let's say like this:

LinkedList players = new LinkedList();

I want to let each player interact with each of the other players, so I write two nested loops:

Iterator i1 = players.iterator();

while (i1.hasNext()) {

String p1 = i1.next();

Iterator i2 = players.iterator();

// But I want to do this: Iterator i2 = i1.clone();

while (i2.hasNext()) {

String p2 = i2.next();

System.out.println("Interact: " + p1 + ", " + p2);

}

}

Since I only want each pair of players to interact once, I want to start the inner loop with the player after the outer loop's current player. So I want to clone the iterator, but that doesn't compile.

So, what should I do instead?

解决方案

The following will do it:

ListIterator i1 = players.listIterator(0);

while (i1.hasNext()) {

String p1 = i1.next();

ListIterator i2 = players.listIterator(i1.nextIndex());

while (i2.hasNext()) {

String p2 = i2.next();

System.out.println("Interact: " + p1 + ", " + p2);

}

}

It relies on the ListIterator's ability to start from the given position and to also know its current position.