我想弄清楚为什么我不能让循环打破，如果"n"为playAgain或总额低于10美元时的输入。如果你看到我如何打破循环运行gameOver函数而不抛出异常，那将是一个很大的帮助。我已经注意到下面的代码，我有麻烦。我不确定为什么会抛出这个异常。如果你能找到如何打破循环，当总数小于10或playAgain为假，请让我知道!
import java.util.Random;
import java.util.Scanner;
public class GameOfCrapsTester {
static Scanner in = new Scanner(System.in);
static Random rand = new Random();
public static void main(String[] args) {
System.out.println("Welcome to the game of Craps");
System.out.println(" ");
System.out.println("The house has given you a starting balance of $500");
System.out.println("On each round, you will make a whole number wager.");
System.out.println("The minimum wager is $10, and the maximum wager is your remaining balance.");
System.out.println(" ");
System.out.println("You may keep playing until you decide to cash in, or");
System.out.println(" you can't cover the minimum wager.");
System.out.println("Good Luck!");
boolean win;
double wins = 0, numOfGames = 0;
int total = 500;
// Come out roll and set point value
int pointValue = 0;
boolean playAgain = true;
while (playAgain && total > 0)
{
System.out.println(" ");
System.out.println("Your balance is $" + total);
System.out.println(" ");
System.out.println("Place your bet: $");
// Get and check wager placed
int bet = in.nextInt();
while (bet > total || bet < 10)
{
if (bet < 10)
{
System.out.println("Bet must be larger than $10.");
}
System.out.println("I'm sorry, that's not a valid wager; please re-enter: ");
bet = in.nextInt();
}
int num = rollDice();
if ((num >= 4 && num <= 10 && num != 7) || num == 0)
{
pointValue = num;
System.out.println(" ");
System.out.println("Your point value is " + pointValue);
System.out.println(" ");
win = rollWithPoint(pointValue);
if (win)
{
total = wonGame(bet, total);
wins++;
numOfGames++;
System.out.println("Wins: " + wins + " Number of games: " + numOfGames);
}
else if (!win)
{
total = lostGame(bet, total);
numOfGames++;
System.out.println("Wins: " + wins + " Number of games: " + numOfGames);
}
}
else if (num == 7 || num == 11)
{
total = wonGame(bet, total);
wins++;
numOfGames++;
System.out.println("Wins: " + wins + " Number of games: " + numOfGames);
}
else
{
total = lostGame(bet, total);
numOfGames++;
System.out.println("Wins: " + wins + " Number of games: " + numOfGames);
}
if (total <= 9) // THIS IS WHERE I AM HAVING TROUBLE
{
break;
}
System.out.println("Keep playing (y/Y or n/N)? ");
in.nextLine();
String again = in.nextLine();
if (again.equalsIgnoreCase("y"))
{
playAgain = true;
}
else if (again.equalsIgnoreCase("n")) // THIS IS WHERE I AM HAVING TROUBLE
{
break;
}
else
{
System.out.println("Invalid character input, try again:");
again = in.nextLine();
}
}// end of loop
gameOver(wins, numOfGames);
} // END of main
public static int rollDice() {
int dice1, dice2, total;
dice1 = rand.nextInt(6) + 1;
dice2 = rand.nextInt(6) + 1;
total = dice1 + dice2;
System.out.print("Your roll: ");
System.out.print("Dice1: " + dice1);
System.out.print(", Dice2: " + dice2);
System.out.println("; Roll Value: " + total);
return total;
} // END of rollDice
public static boolean rollWithPoint(int point) {
int total = rollDice();
boolean winner = false;
while(total != 7 && winner == false)
{
total = rollDice();
if (total == point)
{
winner = true;
}
else
{
winner = false;
}
}
return winner;
} // END of rollWithPoint
public static int lostGame(int bet, int total) {
System.out.println("Oh, I'm sorry, you lost.");
System.out.println(" ");
total = total - bet;
System.out.println("Your current balance: $" + total);
System.out.println(" ");
return total;
} // END of lostGame
public static int wonGame(int bet, int total) {
System.out.println("A winner!");
System.out.println(" ");
total = total + bet;
System.out.println("Your current balance: $" + total);
System.out.println(" ");
return total;
} // END of wonGame
public static void gameOver(double win, double tot) {
double winPercent = (win / tot) * 100;
System.out.println(" ");
System.out.printf("Based on your play, the probability of winning is %.2%", winPercent);
System.out.println(" ");
System.out.println("Seems you lost your shirt; better luck next time.");
System.out.println("Have a nice day! Hope to see you soon!");
} // END of gameOver
} // END of GameOfCraps
当你改变这个(不使用String.format())时没有错误:
System.out.printf("Based on your play, the probability of winning is %.2%", winPercent);
:
System.out.println("Based on your play, the probability of winning is " + winPercent + "%.");
一个小赌注的例子(控制台):
Your balance is $11
Place your bet: $
10
Your roll: Dice1: 1, Dice2: 2; Roll Value: 3
Oh, I'm sorry, you lost.
Your current balance: $1
Wins: 0.0 Number of games: 2.0
Based on your play, the probability of winning is 0.0%.
Seems you lost your shirt; better luck next time.
Have a nice day! Hope to see you soon!
我不能让循环中断如果"n"是playAgain还是当总额低于10美元时。
它也工作得很好。如果我下注低于10，它会让我再下注一点。