java-创建字符串或整数条件

构建调查应用程序时，我遇到了这个问题的障碍。我不明白我的问题到底在哪里，但当我试图创建一个双选项菜单时，它不允许我编译或运行它

错误：

Compiling 2 source files to C:\Users\martin.shaba\Documents\NetBeansProjects\Survey\build\classes
C:\Users\martin.shaba\Documents\NetBeansProjects\Survey\src\survey\Survey.java:71: error: cannot find symbol
            System.out.print("Enter text for question " + (i+1) + ": ");
  symbol:   variable i
  location: class Survey
C:\Users\martin.shaba\Documents\NetBeansProjects\Survey\src\survey\Survey.java:75: error: cannot find symbol
            questions[i] = new IntegerQuestion(input.nextLine(),maxResponses);
  symbol:   variable i
  location: class Survey
2 errors
C:\Users\martin.shaba\Documents\NetBeansProjects\Survey\nbproject\build-impl.xml:930: The following error occurred while executing this line:
C:\Users\martin.shaba\Documents\NetBeansProjects\Survey\nbproject\build-impl.xml:270: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 1 second)

这就是我想要的

从以下选项中选择： S-在字符串中创建一个问题 N-在整数中创建一个问题

我当前的代码：

package survey;

import java.util.Scanner;
import java.io.Serializable;

    public class Survey implements Serializable
    {
        private String surveyName;
        private Question[] questions;
        private int numQuestions;
        private int maxResponses;
        private boolean initialized;

        public Survey(String n)
        {
            surveyName = n;
            initialized = false;
        }


            //initialize() sets up the numQuestions, MaxResponses, and questions for the survey

        public char Questions()
        {
            Scanner input = new Scanner(System.in);

            System.out.println("Initializing survey \"" + surveyName + "\"\n");

            //add a method for password validation!?!?!?  yes!!!  see the bank accounts lab

            System.out.print("Enter max number of responses: ");
            maxResponses = input.nextInt();

            System.out.print("Enter number of questions: ");
            numQuestions = input.nextInt();

            input.nextLine(); //have to do this to "eat" the new line character or the next input won't work correctly
            System.out.println();

            questions = new Question[numQuestions];

            for(int i = 0; i < numQuestions;i++)
            {
               char choice;

            //output menu options
            System.out.println();      
            System.out.println("    S - Create String Question");
            System.out.println("    N - Create Integer Question");


            //loop until a valid input is entered

                System.out.print("Enter choice: ");
                choice = input.next().charAt(0);
                //if choice is one of the options, return it.  Otherwise keep looping
                if(choice == 'S' || choice == 'N'  )
                    return choice;
                else
                {
                    System.out.println("Invalid choice.  Ensure a capital letter. Please re-enter.");
                    choice = '?';
                }
           (choice == '?');

            return choice;  //will never get here, but required to have a return statement to compile   
        }
                System.out.print("Enter text for question " + (i+1) + ": ");

                //you will also need to ask what KIND of question - right now, defaults to integer question

                questions[i] = new IntegerQuestion(input.nextLine(),maxResponses);

            initialized = true;
        }


        /*
            run() gives the survey to a new survey taker, basically asks all the questions in the survey
        */
        public void startSurvey()
        {
            if(initialized)
            {
                System.out.println("Welcome to the survey \"" + surveyName + "\"\n");

                for(int i = 0;i < numQuestions; i ++)
                {
                    questions[i].askQuestion();
                }

                System.out.println("Thank you for participating!");
            }
            else
            {
                System.out.println("Survey has not yet been setup.  Please initialize first.");
            }

        }

        /*
            displayResults() displays the raw data for the survey
        */
        public void Results()
        { 
            System.out.println("Displaying data results for \"" + surveyName + "\"\n");

            for(int i = 0;i < numQuestions; i ++)
            {
                questions[i].displayResults();
                System.out.println();
            }
        }

        /*
            displayReportSummary() should run tests on your data 
            Examples could be: the most common response (median), the average response (mean), or display a graph of the results?
            The choices are endless!
        */
        public void reportSummary()
        {

        }


    }

package调查；
导入java.util.Scanner；
导入java.io.Serializable；
公共类调查实现了可序列化
{
私有字符串surveyName；
私人问题[]问题；
私有整数；
私有int-maxResponses；
私有布尔初始化；
公众调查（第n组）
{
surveyName=n；
初始化=假；
}
//initialize（）设置调查的numQuestions、MaxResponses和问题
公共问题
{
扫描仪输入=新扫描仪（System.in）；
System.out.println（“初始化调查\”+surveyName+“\”\n”）；
//添加密码验证方法！？！？是！！！请参阅银行帐户实验室
System.out.print（“输入最大响应数：”）；
maxResponses=input.nextInt（）；
System.out.print（“输入问题数量：”）；
numQuestions=input.nextInt（）；
input.nextLine（）；//必须这样做才能“吃掉”新行字符，否则下一个输入将无法正常工作
System.out.println（）；
问题=新问题[numQuestions]；
for（int i=0；i

您正在循环外使用

i

。因为您在

for

循环中声明了

i

，所以

i

的范围仅为循环。循环一结束，它就不存在了

---

来自编译器的错误消息告诉您错误在哪一行代码上，以及错误的确切内容。阅读这些内容是值得的。

您使用的是循环外的

i

。因为您在

for

循环中声明了

i

，所以

i

的范围仅为循环。循环一结束，它就不存在了

---

来自编译器的错误消息告诉您错误在哪一行代码上，以及错误的确切内容。阅读这些内容是值得学习的。

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