java - 无法调用某些变量

Question

//Calculating term frequency
    System.out.println("The number of files is this folder is : " + numDoc);

    System.out.println("Please enter the required word  :");
    Scanner scan = new Scanner(System.in);
    String word = scan.nextLine();

    String[] array = word.split(" ");
    int filename = 11;
    String[] fileName = new String[filename];
    int a = 0;

    for (a = 0; a < filename; a++) {
        try {
            System.out.println("The word inputted is " + word);
            File file = new File(
                    "C:\\Users\\user\\fypworkspace\\TextRenderer\\abc" + a
                            + ".txt");
            System.out.println(" _________________");

            System.out.print("| File = abc" + a + ".txt | \t\t \n");

            for (int i = 0; i < array.length; i++) {

                int totalCount = 0;
                int wordCount = 0;

                Scanner s = new Scanner(file);
                {
                    while (s.hasNext()) {
                        totalCount++;
                        if (s.next().equals(array[i]))
                            wordCount++;

                    }

                    System.out.print(array[i] + " ---> Word count =  "
                            + "\t\t " + "|" + wordCount + "|");
                    System.out.print("  Total count = " + "\t\t " + "|"
                            + totalCount + "|");
                    System.out.printf("  Term Frequency =  | %8.4f |",
                            (double) wordCount / totalCount);

                    System.out.println("\t ");

                }
            }
        } catch (FileNotFoundException e) {
            System.out.println("File is not found");

        }

    }
// Count inverse document frequency

    System.out.println("Please enter the required word  :");
    Scanner scan2 = new Scanner(System.in);
    String word2 = scan2.nextLine();
    String[] array2 = word2.split(" ");

    for (int b = 0; b < array2.length; b++) {
        int numofDoc = 0;



        for (int i = 0; i < filename; i++) {

            try {

                BufferedReader in = new BufferedReader(new FileReader(
                        "C:\\Users\\user\\fypworkspace\\TextRenderer\\abc"
                                + i + ".txt"));

                int matchedWord = 0;

                Scanner s2 = new Scanner(in);

                {

                    while (s2.hasNext()) {
                        if (s2.next().equals(array2[b]))
                            matchedWord++;
                    }

                }
                if (matchedWord > 0)
                    numofDoc++;

            } catch (IOException e) {
                System.out.println("File not found.");
            }

        }
        System.out.println(array2[b] + " --> This number of files that contain the term  " +  numofDoc);
        double inverseTF = Math.log10 ( (float)numDoc/ numofDoc );
        System.out.println(array2[b] + " --> IDF " +  inverseTF);
        double TFIDF = ((double) wordCount / totalCount)) * inverseTF);
    }

}

我无法计算 TFIDF，因为编译器说 wordCount 没有初始化为变量。我无法从上面的代码中调用它。任何指导？谢谢。

Answer 1

wordCount 是在 for 循环中声明的局部变量。一旦循环结束，它就会超出范围，无法使用。 totalCount 也存在同样的问题。将它放在 for 循环之前；

int wordCount = 0;
int totalCount = 0;
for (a = 0; a < filename; a++) {
   // ....
}