1 files changed, 90 insertions, 0 deletions
diff --git a/java-practice/javatest/src/javatest/E0204.java b/java-practice/javatest/src/javatest/E0204.java
new file mode 100644
index 0000000..c79e33c
--- /dev/null
+++ b/java-practice/javatest/src/javatest/E0204.java
@@ -0,0 +1,90 @@
+package javatest;
+
+import java.util.HashSet;
+import java.util.Random;
+
+public class E0204 {
+	public static void main(String[] args) {
+		Random r = new Random();
+		HashSet<Card> set = new HashSet<Card>();
+
+		while (set.size() != 4) {
+			set.add(Card.random(r));
+		}
+
+		for (Card card : set) {
+			System.out.println(card);
+		}
+	}
+}
+
+class Card {
+	public static final String[] suits = { "Spades", "Hearts", "Clubs", "Diamonds" };
+	public static final String[] ranks = { "Ace", "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen",
+			"King" };
+
+	public static Card random(Random r) {
+		return new Card(suits[r.nextInt(suits.length)], ranks[r.nextInt(ranks.length)]);
+	}
+
+	public Card(String suit, String rank) {
+		super();
+		this.suit = suit;
+		this.rank = rank;
+	}
+
+	private String suit;
+	private String rank;
+
+	public String getSuit() {
+		return suit;
+	}
+
+	public void setSuit(String suit) {
+		this.suit = suit;
+	}
+
+	public String getRank() {
+		return rank;
+	}
+
+	public void setRank(String rank) {
+		this.rank = rank;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((rank == null) ? 0 : rank.hashCode());
+		result = prime * result + ((suit == null) ? 0 : suit.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		Card other = (Card) obj;
+		if (rank == null) {
+			if (other.rank != null)
+				return false;
+		} else if (!rank.equals(other.rank))
+			return false;
+		if (suit == null) {
+			if (other.suit != null)
+				return false;
+		} else if (!suit.equals(other.suit))
+			return false;
+		return true;
+	}
+
+	@Override
+	public String toString() {
+		return "Card [suit=" + suit + ", rank=" + rank + "]";
+	}
+}