配列の演習としてカードゲームを作ってみよう。
カードのデッキを作る際には下の配列を使うこと
String[] suits={"♠","♦","♥","♣"};
//フォントの関係で表示に不具合が出る場合は下の配列を使う
//String[] suits={"S","D","H","C"};
String[] nums={"1","2","3","4","5","6","7","8","9","10","J","Q","K"};[初級課題]
要素数が５２個の文字列型の配列を作成し、以下の表示を実現せよ。
♠1 ♠2 ♠3 ♠4 ♠5 ♠6 ♠7 ♠8 ♠9 ♠10 ♠J ♠Q ♠K
♦1 ♦2 ♦3 ♦4 ♦5 ♦6 ♦7 ♦8 ♦9 ♦10 ♦J ♦Q ♦K
♥1 ♥2 ♥3 ♥4 ♥5 ♥6 ♥7 ♥8 ♥9 ♥10 ♥J ♥Q ♥K
♣1 ♣2 ♣3 ♣4 ♣5 ♣6 ♣7 ♣8 ♣9 ♣10 ♣J ♣Q ♣K
[中級課題]
カードをシャッフルし、その中から５枚を取り出す。
その結果を数字を小さい順に表示せよ(スーツは考慮しない、今回はKを最大とする)
♠1 ♠2 ♠3 ♠4 ♠5 ♠6 ♠7 ♠8 ♠9 ♠10 ♠J ♠Q ♠K
♦1 ♦2 ♦3 ♦4 ♦5 ♦6 ♦7 ♦8 ♦9 ♦10 ♦J ♦Q ♦K
♥1 ♥2 ♥3 ♥4 ♥5 ♥6 ♥7 ♥8 ♥9 ♥10 ♥J ♥Q ♥K
♣1 ♣2 ♣3 ♣4 ♣5 ♣6 ♣7 ♣8 ♣9 ♣10 ♣J ♣Q ♣K
♠1 ♠10 ♠J ♠Q ♠K
[上級課題]
その5枚がロイヤルストレートフラッシュかどうかを判定せよ。
♠1 ♠2 ♠3 ♠4 ♠5 ♠6 ♠7 ♠8 ♠9 ♠10 ♠J ♠Q ♠K
♦1 ♦2 ♦3 ♦4 ♦5 ♦6 ♦7 ♦8 ♦9 ♦10 ♦J ♦Q ♦K
♥1 ♥2 ♥3 ♥4 ♥5 ♥6 ♥7 ♥8 ♥9 ♥10 ♥J ♥Q ♥K
♣1 ♣2 ♣3 ♣4 ♣5 ♣6 ♣7 ♣8 ♣9 ♣10 ♣J ♣Q ♣K
♠1 ♠10 ♠J ♠Q ♠K
ロイヤルストレートフラッシュです！[解答例]
初級
import java.util.*;
public class CardGame {
public static void main(String[] args) {
String[] suits={"♠","♦","♥","♣"};
//フォントの関係で表示に不具合が出る場合は下の配列を使う
//String[] suits={"S","D","H","C"};
String[] nums={"1","2","3","4","5","6","7","8","9","10","J","Q","K"};
String[] deck=createDeck(suits,nums);
showCards(deck);
}
public static String[] createDeck(String[] suits,String[] nums){
String[] deck=new String[suits.length*nums.length];
for(int i=0;i<deck.length;i++){
deck[i]=suits[i/nums.length]+nums[i%nums.length];
}
return deck;
}
public static void showCards(String[] cards){
for(int i=0;i<cards.length;i++){
System.out.printf("%-5s",cards[i]);
if((i+1)%13==0){
System.out.println();
}
}
System.out.println();
}
}上級
import java.util.*;
public class CardGame {
public static void main(String[] args) {
String[] suits={"♠","♦","♥","♣"};
//フォントの関係で表示に不具合が出る場合は下の配列を使う
//String[] suits={"S","D","H","C"};
String[] nums={"1","2","3","4","5","6","7","8","9","10","J","Q","K"};
String[] deck=createDeck(suits,nums);
showCards(deck);
shuffleDeck(deck);
String[] hands=createHands(0,5,deck);
//hands=new String[]{"♠1","♠K","♠10","♠Q","♠J"};
showHands(hands,suits);
if(isRoyal(hands,suits)){
System.out.println("ロイヤルストレートフラッシュです！");
}else{
System.out.println("ロイヤルストレートフラッシュではありません。");
}
//System.out.println(isFlash(new String[]{"♠1","♠1","♠1","♠1","♥1"}));
//System.out.println(isStraightFlash(new String[]{"♠1","♠K","♠10","♠Q","♠J"},suits));
//getStraightFlashCount(deck,suits);
}
public static String[] createDeck(String[] suits,String[] nums){
String[] deck=new String[suits.length*nums.length];
for(int i=0;i<deck.length;i++){
deck[i]=suits[i/nums.length]+nums[i%nums.length];
}
return deck;
}
public static void showCards(String[] cards){
for(int i=0;i<cards.length;i++){
System.out.printf("%-5s",cards[i]);
if((i+1)%13==0){
System.out.println();
}
}
System.out.println();
}
public static void shuffleDeck(String[] deck){
for(int i=0;i<deck.length-1;i++){
int index=new Random().nextInt(deck.length-i);
String card=deck[index];
deck[index]=deck[deck.length-1-i];
deck[deck.length-1-i]=card;
}
}
public static String[] createHands(int firstIndex,int cardCount,String[] deck){
String[] hands=new String[cardCount];
for(int i=firstIndex;i<firstIndex+cardCount;i++){
hands[i]=deck[i];
}
return hands;
}
public static int getSuitIndex(String card,String[] suits){
String suit=String.valueOf(card.charAt(0));
int i;
for(i=0;i<suits.length;i++){
if(suit.equals(suits[i])){
break;
}
}
return i;
}
public static int getCardNum(String card){
String strNum=card.substring(1,card.length());
int num=0;
switch(strNum){
case "1":
case "2":
case "3":
case "4":
case "5":
case "6":
case "7":
case "8":
case "9":
case "10":
num=Integer.parseInt(strNum);
break;
case "J":
num=11;
break;
case "Q":
num=12;
break;
case "K":
num=13;
}
return num;
}
public static void sortCards(String[] cards,String[] suits){
for(int i=0;i<cards.length-1;i++){
for(int j=i+1;j<cards.length;j++){
if(
getCardNum(cards[i])>getCardNum(cards[j])
|| (getCardNum(cards[i])==getCardNum(cards[j]) && getSuitIndex(cards[i],suits) > getSuitIndex(cards[j],suits))
){
String card=cards[i];
cards[i]=cards[j];
cards[j]=card;
}
}
}
}
public static void showHands(String[] hands,String[] suits){
sortCards(hands,suits);
showCards(hands);
}
public static boolean isFlush(String[] hands){
char first=hands[0].charAt(0);
int i;
for(i=1;i<hands.length;i++){
if(hands[i].charAt(0) != first){
break;
}
}
return i==hands.length;
}
public static boolean isRoyal(String[] hands,String[] suits){
sortCards(hands,suits);
if(!isFlush(hands)){
return false;
}
String[] sample={"1","10","J","Q","K"};
int i;
for(i=0;i<hands.length;i++){
String num=hands[i].substring(1,hands[i].length());
if(!num.equals(sample[i])){
break;
}
}
return i==hands.length;
}
//ストフラが出るまで回し続け何回目で出たかを表示するメソッド
public static void getStraightFlashCount(String[] deck,String[] suits){
int count=0;
while(true){
count++;
shuffleDeck(deck);
String[] hands=createHands(0,5,deck);
if(isRoyal(hands,suits)){
showHands(hands,suits);
System.out.println(count);
break;
}
}
}
}
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