Create ListSortCards2.java

Author: janbodnar

comparesort/ListSortCards2.java

@@ -0,0 +1,92 @@
+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);
+    }
+}