我正在为Java编写一个Craps骰子程序。我无法弄清楚如何将主方法中的Scanner“playerName”传递给playgame方法和rolldice方法。我希望能够让程序在这两种方法中打印播放器名称。 (示例“Jake滚动4和5总共9”而不是“玩家滚动4和5总共9”。我也得到警告Resouce Leak:'sc'永远不会关闭。我是新手编程场景所以,如果你能用简单的术语解释我会非常感激。也欢迎任何改进程序的建议。
import java.util.Scanner;
import java.util.Random;
public class crapsgame
{
//generates random number to be used in method rollDice
private Random randomNumbers = new Random();
//enumeration of constants that represent game status
private enum Status {WIN, LOSE, CONTINUE};
//represents possible outcomes of rolling the dice
private final static int two = 2;
private final static int three = 3;
private final static int seven = 7;
private final static int eleven = 11;
private final static int twelve = 12;
public static void main (String[]args)
{
Scanner sc = new Scanner (System.in);
System.out.println("Enter a player name: ");
String playerName = sc.nextLine();
crapsgame game = new crapsgame(); //created object of class "crapsgame"
game.playgame(); //tells crapsgame object "game" to invoke"playgame" method
}
//method to play game
public void playgame()
{
int currentPoint = 0; //holds point value for current roll
Status gameResult; //contains one of enumeration values
int sumofDice = rollDice(); //sum after first roll
//determines if won, lost, or continue
switch (sumofDice)
{
case seven:
case eleven:
gameResult = Status.WIN;
break;
case two:
case three:
case twelve:
gameResult = Status.LOSE;
break;
//game continues if above conditions are not met
default:
gameResult = Status.CONTINUE;
currentPoint = sumofDice;
System.out.printf("Point is %d\n", currentPoint);
}
while (gameResult == Status.CONTINUE)
{
sumofDice = rollDice();
if (sumofDice == currentPoint)
gameResult = Status.WIN;
else
if (sumofDice == seven)
gameResult = Status.LOSE;
}
if (gameResult == Status.WIN)
System.out.println("Player wins");
else
System.out.println ("Player loses");
}
public int rollDice()
{
//choose a random number from 1-6
int firstroll = 1 + randomNumbers.nextInt(6);
int secondroll = 1 + randomNumbers.nextInt(6);
int sum = firstroll + secondroll;
System.out.printf("Player rolled %d and %d for a total of %d\n", firstroll, secondroll, sum);
return sum;
}
}
答案 0 :(得分:1)
从用户获取名称后,您必须将playerName作为String参数传递给您要使用它的任何函数。 我还把你的班级名改为骆驼案。
import java.util.Scanner;
import java.util.Random;
public class CrapsGame {
//generates random number to be used in method rollDice
private Random randomNumbers = new Random();
//enumeration of constants that represent game status
private enum Status {WIN, LOSE, CONTINUE};
//represents possible outcomes of rolling the dice
private final static int two = 2;
private final static int three = 3;
private final static int seven = 7;
private final static int eleven = 11;
private final static int twelve = 12;
public static void main (String[]args) {
Scanner sc = new Scanner (System.in);
System.out.println("Enter a player name: ");
String playerName = sc.nextLine();
CrapsGame game = new CrapsGame(); //created object of class "CrapsGame"
game.playgame(playerName); //tells CrapsGame object "game" to invoke"playgame" method
}
//method to play game
public void playgame(String playerName) {
int currentPoint = 0; //holds point value for current roll
Status gameResult; //contains one of enumeration values
int sumofDice = rollDice(playerName); //sum after first roll
//determines if won, lost, or continue
switch (sumofDice)
{
case seven:
case eleven:
gameResult = Status.WIN;
break;
case two:
case three:
case twelve:
gameResult = Status.LOSE;
break;
//game continues if above conditions are not met
default:
gameResult = Status.CONTINUE;
currentPoint = sumofDice;
System.out.printf("Point is %d\n", currentPoint);
}
while (gameResult == Status.CONTINUE)
{
sumofDice = rollDice(playerName);
if (sumofDice == currentPoint)
gameResult = Status.WIN;
else if (sumofDice == seven)
gameResult = Status.LOSE;
}
if (gameResult == Status.WIN)
System.out.println(playerName + " wins");
else
System.out.println (playerName + " loses");
}
public int rollDice(String playerName)
{
//choose a random number from 1-6
int firstroll = 1 + randomNumbers.nextInt(6);
int secondroll = 1 + randomNumbers.nextInt(6);
int sum = firstroll + secondroll;
System.out.printf("%s rolled %d and %d for a total of %d\n", playerName, firstroll, secondroll, sum);
return sum;
}
}
答案 1 :(得分:0)
为了将参数传递给方法,需要在方法声明
中声明它们public void playGame(String playerName) {
...
}
然后按以下方式调用方法
String playerName = sc.nextLine();
playGame(playerName);
就您收到的警告而言,您需要在使用它时关闭扫描仪,即
sc.close();
我希望有帮助并欢迎编程!