Compare two return values [duplicate]

Answer 1

Instead of passing the RedDod object and then ignoring, I suggest you make the method non-static and only set fields of that class.

import java.util.Random;

public class RedDog implements Comparable<RedDog> {
    private final Suit suit;
    private final Face face;

    enum Suit {
        CLUB, SPADES, DIAMONDS, HEARTS
    }
    static final Suit[] SUITS = Suit.values();

    enum Face {
        ACE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING
    }
    static final Face[] FACES = Face.values();

    static final Random RAND = new Random();

    public RedDog(Suit suit, Face face) {
        this.suit = suit;
        this.face = face;
    }

    public static RedDog random() {
        return new RedDog(SUITS[RAND.nextInt(SUITS.length)], 
                          FACES[RAND.nextInt(FACES.length)]);
    }

    public static void main(String[] args) {
        RedDog c1 = RedDog.random();
        RedDog c2 = RedDog.random();
        System.out.println(c1 + " and " + c2 + " equals is " + c1.equals(c2));
    }

    @Override
    public boolean equals(Object o) { // generated by my IDE
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        RedDog redDog = (RedDog) o;

        if (suit != redDog.suit) return false;
        return face == redDog.face;

    }

    @Override
    public int hashCode() { // generated by my IDE
        int result = suit != null ? suit.hashCode() : 0;
        result = 31 * result + (face != null ? face.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() { // generated by my IDE
        return "RedDog{" +
                "face=" + face +
                ", suit=" + suit +
                '}';
    }

    @Override
    public int compareTo(RedDog r) {
        int cmp = suit.compareTo(r.suit);
        if (cmp == 0)
            cmp = rank.compareTo(r.rank);
        return cmp;
    }
}

prints

RedDog{face=KING, suit=SPADES} and RedDog{face=QUEEN, suit=DIAMONDS} equals is false