java - Java变量!执行初始化

应该初始化变量a，b，c和d的代码！

public class BufferedReaderFromUserAnd
{
  private static final String FILENAME = "F:/Android.txt";

  public static void main(String args[]) throws IOException
  {
    BufferedWriter bw = null;
    FileWriter fw = null;

    try
    {
      fw = new FileWriter(FILENAME);
      bw = new BufferedWriter(fw);

      BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
      System.out.print("Word1: ");
      String Word1 = reader.readLine();
      System.out.print("Word2: ");
      String Word2 = reader.readLine();
      System.out.print("Word3: ");
      String Word3 = reader.readLine();
      System.out.print("Word4: ");
      String Word4 = reader.readLine();
      System.out.print("Y: ");
      String y = reader.readLine();
      String a = reader.readLine();
      String b = reader.readLine();
      String c = reader.readLine();
      String d = reader.readLine();

      if(y.compareTo(a)==0)
      {
        b = "not" ;
        c = "not" ;
        d = "not" ;
      }

      if(y.compareTo(B)/>/>/>==0)
      {
        a = "not" ;
        c = "not" ;
        d = "not" ;
      }

      if(y.compareTo(c)==0)
      {
        b = "not" ;
        a = "not" ;
        d = "not" ;
      }

      if(y.compareTo(d)==0)
      {
        a = "not" ;
        c = "not" ;
        d = "not" ;
      }


      String n = reader.readLine();

      bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word1 + "  which is " + a +  " the correct answer' />(a) "  + Word1 + "<br/>");
      bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word2 + "  which is " + b +  " the correct answer' />(a) "  + Word2 + "<br/>");
      bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word3 + "  which is " + c +  " the correct answer' />(a) "  + Word3 + "<br/>");
      bw.write("<input type='radio' name='rbnNumber' value='You selected (a) " + Word4 + "  which is " + d +  " the correct answer' />(a) "  + Word4 + "<br/>");
    }
    catch (IOException e) {
      e.printStackTrace();
    }
    finally
    {
      try {
        if (bw != null)
          bw.close();
        if (fw != null)
          fw.close();
      }
      catch (IOException ex) {
        ex.printStackTrace();
      }
    }
  }
}

在提示符下输入a时，结果为


  输入type ='radio'name ='rbnNumber'value ='您选择了（a）Android
  这是正确的答案'/>（a）Android输入type ='radio'
  name ='rbnNumber'value ='您选择了（a）正确的CS
  答案'/>（a）CS输入类型='无线电'名称='rbnNumber'值='您
  选择了（a）正确答案的OS'/>（a）OS输入
  type ='radio'name ='rbnNumber'value ='您选择的（a）代码是
  正确答案'/>（a）代码
  
  变量应动态初始化，预期结果为
  
  输入type ='radio'name ='rbnNumber'value ='您选择了（a）Android
  这是正确的答案'/>（a）Android输入type ='radio'
  name ='rbnNumber'value ='您选择了（a）不正确的CS
  答案'/>（a）CS输入类型='无线电'名称='rbnNumber'值='您
  选择了（a）不是正确答案的OS'/>（a）OS输入
  type ='radio'name ='rbnNumber'value ='您选择的（a）代码是
  答案不正确'/>（a）代码

最佳答案

我修改并简化了您的代码，并为您解决了问题。基本上，如果您只是在读写行，则应该考虑使用Scanner / PrintStream而不是Reader / Writer，因为它们更加方便。另外，当发现自己在重复代码时，应将其移至单独的方法中，然后使用不同的参数调用该方法。

public class ReadOptionsFromUser {
    private static final Scanner INPUT = new Scanner(System.in);
    private static final String FILENAME = "F:/Android.txt";

    public static void main(String[] args) throws FileNotFoundException {
        try (PrintStream output = new PrintStream(FILENAME)) {
            readFromUser(output);
        }
    }

    public static void readFromUser(PrintStream output) {
        String wordA = readLine("Word (a)");
        String wordB = readLine("Word (b)");
        String wordC = readLine("Word (c)");
        String wordD = readLine("Word (d)");
        String answer = readLine("Correct letter");

        output.println(radio("a", wordA, answer));
        output.println(radio("b", wordB, answer));
        output.println(radio("c", wordC, answer));
        output.println(radio("d", wordD, answer));
    }

    private static String readLine(String prompt) {
        System.out.print(prompt + ": ");
        return INPUT.nextLine();
    }

    private static String radio(String letter, String word, String answer) {
        String option = "(" + letter + ") " + word;
        String is = letter.equals(answer) ? "is" : "is not";

        return "<input type='radio' name='rbnNumber' value='You selected "
                + option + " which " + is +  " the correct answer' />"
                + option + "<br/>";
    }
}