Sorting

public class Card implements Comparable<Card> {
    private int rank;
    public Card(int r) { rank = r; }
    public int compareTo(Card other) {
        return rank - other.rank;
    }
    public int getRank() { return rank; }
}
// Usage:
Card a = new Card(5);
Card b = new Card(8);
int r = a.compareTo(b);
System.out.print(r < 0);

• A

  false

• B

  0

• C

  true

  check_circle
• D

  Compile error