import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
A standard deck of 52 playing cards consists of four suits:
spades (♠), hearts (♥), diamonds (♦), and clubs (♣).
Each suit contains 13 ranks:
Ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, Jack, Queen, King.
Cards of spades and clubs are black, while hearts and diamonds are red.
Color is informational only — it does not affect shuffling or random selection.
*/
/**
This program performs multiple draws of 5 random cards from a 52‑card deck
WITHOUT duplicates across draws.
It uses:
- List<String> for the deck
- Collections.shuffle for efficient randomization
- Functions for clean structure
Algorithm:
1. Build a full deck (52 cards)
2. For each draw:
a. Shuffle the remaining deck
b. Draw 5 cards
c. Remove them from the deck
*/
public class CardDraws {
// Build a full 52-card deck
public static List<String> buildDeck() {
String[] ranks = {
"2","3","4","5","6","7","8","9","10","J","Q","K","A"
};
String[] suits = {
"Clubs", "Diamonds", "Hearts", "Spades"
};
List<String> deck = new ArrayList<>(52);
for (String suit : suits) {
for (String rank : ranks) {
deck.add(rank + " of " + suit);
}
}
return deck;
}
// Shuffle and draw 5 cards, then remove them
public static void drawFive(List<String> deck, int drawNumber) {
Collections.shuffle(deck);
System.out.println("Draw #" + drawNumber + ":");
for (int i = 0; i < 5; i++) {
System.out.println(" " + deck.get(i));
}
System.out.println();
// Remove drawn cards
for (int i = 0; i < 5; i++) {
deck.remove(0);
}
}
public static void main(String[] args) {
// Number of draws
int draws = 3;
// Build the deck
List<String> deck = buildDeck();
// Perform multiple draws (no duplicates)
for (int i = 1; i <= draws; i++) {
if (deck.size() < 5) {
System.out.println("Not enough cards left for draw #" + i + ".");
break;
}
drawFive(deck, i);
}
}
}
/*
run:
Draw #1:
4 of Clubs
Q of Hearts
2 of Spades
9 of Spades
5 of Clubs
Draw #2:
3 of Diamonds
3 of Hearts
J of Clubs
J of Hearts
2 of Hearts
Draw #3:
6 of Spades
8 of Hearts
7 of Hearts
Q of Diamonds
10 of Clubs
*/
