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ListSortCards2.java
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92 lines (72 loc) · 1.89 KB
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package com.zetcode;
import java.util.Comparator;
import java.util.List;
// sorting a list of objects by implementing a Comparable and
// internal compareTo method
class Card implements Comparable<Card> {
@Override
public int compareTo(Card o) {
return Comparator.comparing(Card::getRank)
.thenComparing(Card::getSuit)
.compare(this, o);
}
public enum Suit {
CLUBS,
DIAMONDS,
HEARTS,
SPADES
}
public enum Rank {
TWO,
THREE,
FOUR,
FIVE,
SIX,
SEVEN,
EIGHT,
NINE,
TEN,
JACK,
QUEEN,
KING,
ACE,
}
private Suit suit;
private Rank rank;
public Card(Rank rank, Suit suit) {
this.rank = rank;
this.suit = suit;
}
public Rank getRank() {
return rank;
}
public Suit getSuit() {
return suit;
}
public void showCard() {
rank = getRank();
suit = getSuit();
System.out.println(rank + " of " + suit);
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder("Card{");
sb.append("suit=").append(suit);
sb.append(", rank=").append(rank);
sb.append('}');
return sb.toString();
}
}
public class ListSortCards2 {
public static void main(String[] args) {
var cards = List.of(
new Card(Card.Rank.KING, Card.Suit.DIAMONDS),
new Card(Card.Rank.FIVE, Card.Suit.HEARTS),
new Card(Card.Rank.ACE, Card.Suit.CLUBS),
new Card(Card.Rank.NINE, Card.Suit.SPADES),
new Card(Card.Rank.JACK, Card.Suit.SPADES),
new Card(Card.Rank.JACK, Card.Suit.DIAMONDS));
var sorted = cards.stream().sorted().toList();
sorted.forEach(System.out::println);
}
}