Java 编程 — 标记 "."出现语法错误，@ 在此标记之后

Question

我的代码中的 System.out.println 语句出现错误。我不确定为什么会出现这种情况，代码运行良好并且似乎没有任何其他错误，它一定是程序中其他地方的某些代码导致了它。这是错误:

Syntax error on token ".", @ expected after this token

请看下面的代码。我已经用粗体标记了发生错误的行。但是，它不会停止程序运行。我知道这里有一个类似的不同问题，但我似乎无法根据它找出我的问题。 Syntax error on token ".", @ expected after this token

错误图片:

//Method for analysing filepath

public static void fileAnalysis() throws IOException {

    // read in filepath

    System.out.println("Please enter the filepath: ");

    Scanner fileInput = new Scanner(System.in);
    String filepath = fileInput.nextLine();

    // read in file
    Scanner textToBeRead = new Scanner(new FileInputStream(filepath));
    Path path = Paths.get(filepath);
    String fileContents = Files.readAllLines(path).toString();

    fileContents = fileContents.replace('!', ' ').replace('?', ' ').replace('.',' ').replace(',',' ')
            .replace(':',' ').replace(';',' ').replace('(',' ').replace(')',' ');

    String[] wordArray = fileContents.split(" ");

    // Create a HashMap object to contain words and times they occur
    Map <String, Integer> wordFrequencies = new HashMap <String, Integer> ();

    //splits text into array of words

    // Initialize frequency table from text file
    for (String a : wordArray)
    {
        String _a = a.toLowerCase();

        //If _a contains '\''
        //Then
        //If '\'' is at the very beginning or very end, Then get rid of it
        //Else keep it

        Integer freq = wordFrequencies.get(_a);
        wordFrequencies.put(_a, (freq == null) ? 1 : freq + 1);

    }

    System.out.println (wordFrequencies.size() + " distinct words:");
    System.out.println (wordFrequencies);
    fileInput.close();
    textToBeRead.close();
}

//主要方法

import java.io.FileInputStream; import java.io.IOException; import
java.nio.charset.StandardCharsets; import java.nio.file.Files; import
java.nio.file.Path; import java.nio.file.Paths; import
java.util.HashMap; import java.util.List; import java.util.Map; import
java.util.Scanner;

public class TextProcessorUsingHashmaps {   
    public static void main(String[] args) throws IOException {

        System.out.println("Please choose run mode: demo , file , text");
        Scanner mode = new Scanner (System.in);
        String modeChoice = mode.nextLine();

        if (modeChoice.equals ("file")){
          fileAnalysis();
        }

        else{
          System.out.println("Invalid. Please select a valid mode.");
        }

        mode.close();   
    }
}

Answer 1

在您的 TextProcessorCalc 文件中，将您的方法包装在一个类中，如下所示:

public class TextProcessorMain {  YOUR METHODS }

然后从 TextProcessorMain 文件中，使用句号并在 TextProcessor Calc(类)之前调用方法，如下所示:

 if (modeChoice.equals ("demo")){
      TextProcessorCalc.demo();
    }

这应该可以解决错误。