Java 到文件中*/ 试一试{ BufferedWriter writeEquation=new BufferedWriter（new FileWriter（“Equations.txt”）； BufferedWriter writeAnswer=新的BufferedWriter（新文件编写器（“Answers.txt”）； 对于（intθ=0；θ

如果不运行此命令，我假设您只获得了“奖金：输入0”

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这两条线有着天壤之别。

我解决了这个问题。我的旧代码是：

int tempDivisionY = singleDigitNaturalGen.nextInt(11), tempDivisionX = singleDigitNaturalGen.nextInt(11);
double answer = ((double)tempDivisionY / (double)tempDivisionX);
String equation = ""; 

当它应该说：

String equation = tempDivisionY + " / " + tempDivisionX;

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“如果您需要任何解释，请随时询问……”

——是的，请解释您的代码和问题。细节确实很重要。我添加了更多关于我的代码的细节，我无法更好地解释这个问题，因为我不知道为什么会遇到它。很抱歉，我将取消对附加信息的否决票，希望您能尽快得到一个合理的答案，但对于我来说，我将等待更多信息，包括对您当前代码的更详细解释，包括方法应该做什么。还有，您调试代码的尝试（包括使用调试器）向您展示了什么？我尝试注释了随机选择要添加到组合方程数组中的方程的部分，只需打印每个单独的方程和答案数组，方程和答案似乎工作正常，因此它必须位于代码块中的某个位置，从注释“/”开始，这将使方程在分类方程数组中以随机顺序排列，以准备写入equations.txt文件*/”。此外，我已经删除了我认为无用的代码的一大部分，因为它只是两位数的代码，我还没有用过。不管怎样，如果（Menu.subgrationbool）我将条件改为：“Menu.subgrationbool”以获得良好的实践，但这并没有改变equations.txt文件中的任何内容。谢谢你的建议。

public class Menu {

    public static boolean additionBool = true;
    public static boolean subtractionBool = true;
    public static boolean multiplicationBool = true;
    public static boolean divisionBool = true;
    public static boolean doubleDigitBool = false;

    new EquationsAndAnswers().writeBoth();  
}

import java.util.Random;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

import javax.swing.JOptionPane;

public class EquationsAndAnswers {
/*Random Generators*/
    Random singleDigitNaturalGen = new Random();
    Random randomEquationPicker = new Random();
    Random doubleDigitNaturalGen = new Random();
public void writeBoth(){    



    /*Declaration of Four Basic Mathematic Operation Equation Arrays and Corresponding Answers*/
    String additionArrayEquation[] = new String[100];
    int additionArrayAnswers[] = new int[100];

    String subtractionArrayEquation[] = new String[100];
    int subtractionArrayAnswers[] = new int[100];

    String multiplicationArrayEquation[] = new String[100];
    int multiplicationArrayAnswers[] = new int[100];

    String divisionArrayEquation[] = new String[100];
    double divisionArrayAnswers[] = new double[100];

    String assortedEquations[] = new String[100];
    double assortedAnswers[] = new double[100];

    /*Population of Basic Operation Equation Arrays*/
    /*Population of Addition Equation and Answer Arrays*/
    for(int additionArrayGenerationX = 0; additionArrayGenerationX < additionArrayEquation.length; additionArrayGenerationX++){

        int tempAdditionY = singleDigitNaturalGen.nextInt(11), tempAdditionX = singleDigitNaturalGen.nextInt(11);
        int answer = tempAdditionY + tempAdditionX;
        String equation = (tempAdditionY + " + " + tempAdditionX); 
        additionArrayEquation[additionArrayGenerationX] = equation;
        additionArrayAnswers[additionArrayGenerationX] = answer;
    }



    /*Population of Subtraction Equation and Answer Arrays*/
    for(int subtractionArrayGenerationX = 0; subtractionArrayGenerationX < subtractionArrayEquation.length; subtractionArrayGenerationX++){

        int tempSubtractionY = singleDigitNaturalGen.nextInt(11), tempSubtractionX = singleDigitNaturalGen.nextInt(11);
        int answer = tempSubtractionY - tempSubtractionX;
        String equation = (tempSubtractionY + " - " + tempSubtractionX); 
        subtractionArrayEquation[subtractionArrayGenerationX] = equation;

        subtractionArrayAnswers[subtractionArrayGenerationX] = answer;
    }


    /*Population of Multiplication Equation and Answer Arrays*/
    for(int multiplicationArrayGenerationX = 0; multiplicationArrayGenerationX < multiplicationArrayEquation.length; multiplicationArrayGenerationX++){

        int tempMultiplicationY = singleDigitNaturalGen.nextInt(11), tempMultiplicationX = singleDigitNaturalGen.nextInt(11);
        int answer = tempMultiplicationY*tempMultiplicationX;
        String equation = ""; 
        multiplicationArrayEquation[multiplicationArrayGenerationX] = equation;

        multiplicationArrayAnswers[multiplicationArrayGenerationX] = answer;
    }



    /*Population of Division Equation and Answer Arrays*/
    for(int divisionArrayGenerationX = 0; divisionArrayGenerationX < divisionArrayEquation.length; divisionArrayGenerationX++){

        int tempDivisionY = singleDigitNaturalGen.nextInt(11), tempDivisionX = singleDigitNaturalGen.nextInt(11);
        double answer = ((double)tempDivisionY / (double)tempDivisionX);
        String equation = ""; 
        divisionArrayEquation[divisionArrayGenerationX] = equation;

        divisionArrayAnswers[divisionArrayGenerationX] = answer;
    }



    /*Deciding on Equations to be displayed.*/
    int i = 0;

    System.out.println(additionArrayEquation[0]);//dev

    /*This puts the equations in a random order in the assortedEquations array, in preparation to be written to the Equations.txt file*/        
    for(int epsilon = 0; epsilon < assortedEquations.length; epsilon++){    

        int equationType = randomEquationPicker.nextInt(4);

        if(equationType == 0){
            if(Menu.additionBool = true){
                assortedEquations[epsilon] = additionArrayEquation[i];
                assortedAnswers[epsilon] = additionArrayAnswers[i];
            }
            else{
                assortedEquations[epsilon] = "Bonus: Enter 0";
            }
        }

        else if(equationType == 1){
            if(Menu.subtractionBool = true){
                assortedEquations[epsilon] = subtractionArrayEquation[i];
                assortedAnswers[epsilon] = subtractionArrayAnswers[i];
            }

            else{
                assortedEquations[epsilon] = "Bonus: Enter 0";
            }
        }
        else if(equationType == 2){
            if(Menu.multiplicationBool = true){         
                assortedEquations[epsilon] = multiplicationArrayEquation[i];
                assortedAnswers[epsilon] = multiplicationArrayAnswers[i];
            }
            else{
                assortedEquations[epsilon] = "Bonus: Enter 0";
            }
        }   
        else{
            if(Menu.divisionBool = true){
                assortedEquations[epsilon] = divisionArrayEquation[i];
                assortedAnswers[epsilon] = divisionArrayAnswers[i];
            }
            else{
                assortedEquations[epsilon] = "Bonus: Enter 0";
            }
        }
    }


    /*Writing each equation to the file.*/
    try {
        BufferedWriter writeEquation = new BufferedWriter(new FileWriter("Equations.txt"));
        BufferedWriter writeAnswer = new BufferedWriter(new FileWriter("Answers.txt"));

        for(int theta = 0; theta < assortedEquations.length; theta++){
            writeEquation.write(assortedEquations[theta]+ "\n");
            writeAnswer.write(assortedAnswers[theta] + "\n");
        }



        writeEquation.close();
        writeAnswer.close();
    } catch (IOException e) {JOptionPane.showMessageDialog(null, "Whoops, there seems to have been an error. Sorry about that.");}
}
}

if(Menu.subtractionBool = true)
if(Menu.subtractionBool == true)

int tempDivisionY = singleDigitNaturalGen.nextInt(11), tempDivisionX = singleDigitNaturalGen.nextInt(11);
double answer = ((double)tempDivisionY / (double)tempDivisionX);
String equation = ""; 

String equation = tempDivisionY + " / " + tempDivisionX;