Mi sto avvicinando per la prima volta al linguaggio Java, ma c'è una difficoltà che mi blocca.
Come editor per i programmi sto usando il JBUILDER X della Borland.
Ho provato a digitare un programma riportato su un manuale (JAVA guida alla programmazione)e si tratta del programma che simula il gioco del Black Jack.
Nell'esecuzione mi da un errore nel seguente blocco di codice :
1 boolean playerTakesAHit() throws IOException {
2 char ch = ' ';
3 do{
4 System.out.print("Hit or Stay: ");
5 System.out.flush();
6 String playersDecision = keyboardInput.readLine();
7 try ch =playersDecision.charAt(0);
8 catch (StringIndexOutOfBoundsException exception) ;
9 if(ch == 'H' || ch == 'h') return true;
10 if(ch == 'S' || ch == 's') return false;
11 } while(true);
12 }
Mi da i seguenti errori:
Nella linea 7 dice ( '}' expected )
Nella linea 8 dice ( "catch" without "try" )
Sempre nella 7 dice ( "try" without "catch" or "finaly" at line 7
Potete aiutarmi ? Grazie anticipate :rollo:
Nel caso vi occorra vi sottoscrivo l'intero programma anche se è molto lungo
import java.lang.System;
import java.lang.Integer;
import java.lang.NumberFormatException;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.Random;
class BlackJack {
public static void main (String args[]) throws IOException {
// Create a BlackJackGame object ...
BlackJackGame game = new BlackJackGame();
// and play it!
game.play();
}
}
class BlackJackGame {
// Variable declarations
int bet;
int money;
Deck deck;
Hand playersHand;
Hand dealersHand;
DataInputStream keyboardInput;
// Method declarations
public BlackJackGame() { // Constructor
bet = 0;
money = 1000;
deck = new Deck();
keyboardInput = new DataInputStream(System.in);
}
void play() throws IOException {
System.out.println("Welcome to Blackjack!");
System.out.println("You have $"+Integer.toString(money)+".");
do {
placeBet();
if(bet>0) {
initialDeal();
if(playersHand.blackjack()) playerWins();
else{
while(playersHand.under(22) && playerTakesAHit()) {
playersHand.addCard(deck.deal());
playersHand.show(false,false);
}
while(dealersHand.mustHit())
dealersHand.addCard(deck.deal());
dealersHand.show(true,false);
showResults();
}
}
} while (bet>0);
}
void placeBet() throws IOException, NumberFormatException {
do{
System.out.print("Enter bet: ");
System.out.flush();
bet = Integer.parseInt(keyboardInput.readLine());
} while(bet<0 || bet>money);
}
void initialDeal() {
System.out.println("New hand...");
playersHand = new Hand();
dealersHand = new Hand();
for(int i = 0;i<2;++i) {
playersHand.addCard(deck.deal());
dealersHand.addCard(deck.deal());
}
dealersHand.show(true,true);
playersHand.show(false,false);
}
void playerWins() {
money += bet;
System.out.println("Player wins $"+Integer.toString(bet)+".");
System.out.println("Player has $"+Integer.toString(money)+".");
}
void dealerWins() {
money -= bet;
System.out.println("Player loses $"+Integer.toString(bet)+".");
System.out.println("Player has $"+Integer.toString(money)+".");
}
void tie() {
System.out.println("Tie.");
System.out.println("Player has $"+Integer.toString(money)+".");
}
boolean playerTakesAHit() throws IOException {
char ch = ' ';
do{
System.out.print("Hit or Stay: ");
System.out.flush();
String playersDecision = keyboardInput.readLine();
try ch =playersDecision.charAt(0);
catch (StringIndexOutOfBoundsException exception) ;
if(ch == 'H' || ch == 'h') return true;
if(ch == 'S' || ch == 's') return false;
} while(true);
}
void showResults() {
if(playersHand.busted() && dealersHand.busted()) tie();
else if(playersHand.busted()) dealerWins();
else if(dealersHand.busted()) playerWins();
else if(playersHand.bestScore() > dealersHand.bestScore()) playerWins();
else if(playersHand.bestScore() < dealersHand.bestScore()) dealerWins();
else tie();
}
}
// End of BlackJackGame class
class Deck {
// Variable declarations
int cards[]; // Array of 52 cards
int topCard; // 0-51 (index of card in deck)
Random random;
// Method declarations
public Deck() { // Constructor
cards = new int[52];
for(int i = 0;i<52;++i) cards[i] = i;
topCard = 0;
random = new Random();
shuffle();
}
public void shuffle() {
// Repeat 52 times
for(int i = 0;i<52;++i) {
// Randomly exchange two cards in the deck.
int j = randomCard();
int k = randomCard();
int temp = cards[j];
cards[j] = cards[k];
cards[k] = temp;
}
}
int randomCard() {
int r = random.nextInt();
if(r<0) r = 0-r;
return r%52;
}
Card deal() {
if(topCard>51) {
shuffle();
topCard = 0;
}
Card card = new Card(cards[topCard]);
++topCard;
return card;
}
} // End of Deck class
class Hand {
// Variable declarations
int numCards;
Card cards[];
static int MaxCards = 12;
//Method declarations
public Hand() { // Constructor
numCards = 0;
cards = new Card[MaxCards];
}
void addCard(Card c) {
cards[numCards] = c;
++numCards;
}
void show(boolean isDealer,boolean hideFirstCard) {
if(isDealer) System.out.println("Dealer:");
else System.out.println("Player:");
for(int i = 0;i<numCards;++i) {
if(i == 0 && hideFirstCard) System.out.println(" Hidden");
else System.out.println(" "+cards[i].value+" of "+cards[i].suitsuite);
}
}
boolean blackjack() {
if(numCards == 2) {
if(cards[0].iValue == 1 && cards[1].iValue == 10) return true;
if(cards[1].iValue == 1 && cards[0].iValue == 10) return true;
}
return false;
}
boolean under(int n) {
int points = 0;
for(int i = 0;i<numCards;++i) points += cards[i].iValue;
if(points<n) return true;
else return false;
}
int bestScore() {
int points = 0;
boolean haveAce = false;
for(int i = 0;i<numCards;++i) {
points += cards[i].iValue;
if(cards[i].iValue == 1) haveAce = true;
}
if(haveAce) {
if(points+10 < 22) points += 10;
}
return points;
}
boolean mustHit() {
if(bestScore()<17) return true;
else return false;
}
boolean busted() {
if(!under(22)) return true;
else return false;
}
} // End of Hand class
class Card {
// Variable declarations
int iValue; // Numeric value corresponding to card.
String value; // "A" "2" through "9" "T" "J" "Q" "K"
String suitsuite; // "S" "H" "C" "D"
// Method declarations
public Card(int n) { // Constructor
int iSuitSuite = n/13;
iValue = n%13+1;
switch(iSuitSuite) {
case 0:
suitsuite = "Spades";
break;
case 1:
suitsuite = "Hearts";
break;
case 2:
suitsuite = "Clubs";
break;
default:
suitsuite = "Diamonds";
}
if(iValue == 1) value = "Ace";
else if(iValue == 10) value = "Ten";
else if(iValue == 11) value = "Jack";
else if(iValue == 12) value = "Queen";
else if(iValue == 13) value = "King";
else value = Integer.toString(iValue);
if(iValue>10) iValue = 10;
}
int getValue() {
return iValue;
}
} }
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