【发布时间】：2013-05-01 18:21:27
【问题描述】：
我正在尝试制作一个问答游戏。我想知道当我运行程序时，我的while 语句出现了无限循环。当我进入游戏后运行我的代码时，它会打印问题，但在我输入答案之前，它会给我一个Exception 错误。我不太确定如何解决它。
/**
* @(#)QuizGameFinal2.java
*
*
* @author
* @version 1.00 2013/4/30
*/
import java.util.Scanner;
import java.lang.Math;
import java.lang.String;
public class QuizGameFinal2
{
public static void main(String[]args)
{
int option_Selected = 0;
int option_Single_Player = 1;
int option_Multiplayer = 2;
int answer = 0;
int player_One_Answer = 0;
int player_Two_Answer = 0;
String response;
int player_One_Winnings = 0;
int player_Two_Winnings = 0;
int winnings = 0;
int computer_Winnings = 0;
double computer_Answer = 0;
Scanner input2 = new Scanner(System.in);
say_Intro();
say_Before_First_Question();
question_One();
human_Answer();
while (answer < 1 && answer >= 4);
{
System.out.println("Enter a number between 1 and 3");
}
if (answer == 1)
{
System.out.println("Correct Next Question");
question_Two();
human_Answer();
while (answer < 1 && answer >= 4);
{
System.out.println("Enter a number between 1 and 3");
}
if (answer == 1 )
{
System.out.println("Correct Next Question");
question_Three();
human_Answer();
while (answer < 1 && answer > 4);
{
System.out.println("Enter a number between 1 and 3");
}
if (answer == 4)
{
System.out.println("Correct Next Question");
}
else
{
System.out.println("Incorrect you win 1000 dollers");
winnings = 1000;
}
}
else
{
System.out.println("Incorrect you win 500 dollers");
winnings = 500;
}
}
else
{
System.out.println("Incorrect you win 0 dollers");
winnings = 0;
}
} // End of main method
public static void say_Intro() // Intro Method
{
System.out.println("Welcome to the QuizGame"); // Player selects which mode
}
public static void say_Before_First_Question() // Before game method
{
System.out.println("");
System.out.println(" If you get a question wrong your out.");
System.out.println("Also you will be competing against a super computer, after you play then he will generate answers, if you have the most then you win");
System.out.println("Ok first question");
}
public static void human_Answer () // Human Answer Single Player Method
{
Scanner input2 = null;
Object answer = input2.nextInt();
}
static void player_One_Answer() // Player One Multiplayer Method
{
Scanner input2 = null;
int player_One_Answer = input2.nextInt();
}
public static void player_Two_Answer() // Player two multiplayer Method
{
Scanner input2 = null;
int player_Two_Answer = input2.nextInt();
}
public static void computer_Answer () // Computer answer
{
double computer_Answer = (1-1 + 1) * Math.random() + 1;
computer_Answer = (int)computer_Answer;
}
public static void question_One() // Question 1 method
{
System.out.println("");
System.out.println("What is an application");
System.out.println("1: A program that performs a task 2:A mouse 3: java.util.Scanner");
}
public static void question_Two() // Question 2 to 10 methods below
{
System.out.println("What is the data type that hold the value 1");
System.out.println("1: int 2:float 3: short 4: long ");
}
public static void question_Three()
{
System.out.println("What is a not a high level language");
System.out.println("1: Java 2:C++ 3: Colbolt 4: Machine Language ");
}
/* public static void question_Five()
{
}
public static void question_Six()
{
}
public static void question_Seven()
{
}
public static void question_Eight()
{
}
public static void question_Nine()
{
}
public static void question_Ten()
{
}
public static void total_Winnings_Single_Player () // Calculating who wins method single player
{
if (computer_Winnings > winnings)
{
System.out.println("Computer Wins");
}
else
{
System.out.println("You win");
}
*/
}
// I get infinite loop om my while statements and I get an exepction error on my values with null
【问题讨论】：
-
尝试trim代码并发布异常堆栈跟踪。
-
请自动格式化代码（在 Eclipse 中为 Ctrl+Shift+F）
-
您的帖子需要格式化、修剪和更多信息（堆栈跟踪在哪里？）
-
您在尝试在您的回答方法中使用它之前将您的扫描仪无效，这显然会导致 NPE。如果答案是 3，您的第一个 while 循环也将永远运行。除此之外，您的代码还有很多其他问题..