while (player1.size()>0&&player2.size()>0) {
    i++;
    Card p1 = player1.removeFirst();
    Card p2 = player2.removeFirst();
    if(p1.value > p2.value) {
        player1.addLast(p1);
        player1.addLast(p2);
    } else if (p1.value < p2.value) {
        player2.addLast(p1);
        player2.addLast(p2);
    }
}