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������Comparable���������������compareTo������

class Card implements Comparable
    
      {    public int rank;    public String suit;    public Card(int rank, String suit) {        this.rank = rank;        this.suit = suit;    }    @Override    public String toString() {        return "Card{" + "rank=" + rank + ", suit='" + suit + '}';    }    @Override    public int compareTo(Card o) {        return this.rank - o.rank;    }}class TestDemo {    public static void main(String[] args) {        Card card1 = new Card(1, "���");        Card card2 = new Card(2, "���");        Card card3 = new Card(3, "���");        PriorityQueue
     
       qu = new PriorityQueue<>();        qu.offer(card2);        qu.offer(card1);        System.out.println(qu.poll());  // ���������Card{ rank=1, suit='���'}        System.out.println(qu.poll());  // ���������Card{ rank=2, suit='���'}    }}
     
    

������Comparator���������������compare������

class TestDemo {    public static void main(String[] args) {        Card2 card1 = new Card2(1, "���");        Card2 card2 = new Card2(2, "���");        Card2 card3 = new Card2(3, "���");        PriorityQueue
    
      qu2 = new PriorityQueue<>(new Comparator
     
      () {            @Override            public int compare(Card2 o1, Card2 o2) {                return o1.rank - o2.rank;            }        });        qu2.offer(card2);        qu2.offer(card1);        qu2.offer(card3);        System.out.println(qu2.toString());  // ���������[Card2{ rank=1, suit='���'}, Card2{ rank=2, suit='���'}, Card2{ rank=3, suit='���'}}    }}