java - java中使用四种方法统计并显示文件中的行数、单词数、字符数

Question

这是我第一次在程序中使用多种方法，而且我也从未尝试过计算文件中的行数、单词和字母。因此，我阅读了三本 Java 书籍的文件部分，然后查看了此处论坛上的问题并进行了尝试。我认为我在变量名上做错了，因为我不知道将它们放入多方法等中的规则。如果你可以说这样的事情是明显错误的，因为你必须这样做，那就是有帮助。我无法使用调试器，因为我无法编译它。不管怎样，感谢您看到这里。

import java.util.Scanner;
    import java.io.*;

    /**
     * A program to count the number of lines, words and characters in a text file.
     * 
     * @author 
     * @version 2014
     */
    public class WordCount
    {
        public static void main(String[] args)  throws FileNotFoundException 
        {
            // get the filename
            Scanner keyboard = new Scanner(System.in);

            System.out.print("Enter the name of the file: ");
            String filename = keyboard.nextLine();

            File file = new File(filename);
            Scanner inputFile = new Scanner(file);

            lines(filename);
            words(filename);
            characters(filename);
        }

        /**
         * Count the number of lines in a file, and print out the result.
         * 
         */
        public static void lines(String filename)  throws FileNotFoundException 
        {
            Scanner inputFile = new Scanner(file);
            int lines = 0;

            while (inputFile.hasNextLine())
            {
                lines++;
                file.nextLine();
            }
            return lines;

            inputFile.close();
        }

        /**
         * Count the number of words in a file, and print out the result.
         *
         */
        public static void words(String filename)  throws FileNotFoundException 
        {
            Scanner inputFile = new Scanner(file);
            int words = 0;

            while (input.hasNextLine())
            {
                String word = input.next();
                words++;
            }
            return words;

            inputFile.close();
        }

        /**
         * Count the number of characters in a file, and print out the result.
         * 
         */
        public static void characters(String filename)  throws FileNotFoundException 
        {
            Scanner inputFile = new Scanner(file);
            int characters = 0;

            while (inputFile.hasNextLine())
            {
                String line = inputFile.nextLine();
                for(int i = 0; i < line.length(); i++)
                { characters = line.charAt(i);
                    if (character != 32) 
                    { 
                        characters++;
                    }
                }
            }
            return characters;
            inputFile.close();

            System.out.println("The number of lines is: " + lines);
            System.out.println("The number of words is: " + words);
            System.out.println("The number of characters is: " + characters);
            System.out.println();
        }

    }

Answer 1

更改以下内容

public static int lines(String filename)  throws FileNotFoundException 
//change the return type to int instead of void
{
    Scanner inputFile = new Scanner(filename); //filename instead of file
    int lines = 0;

    while (inputFile.hasNextLine())
    {
        lines++;
        inputFile.nextLine(); // ---do----
    }
    inputFile.close(); // after return it will become unreachable
    return lines;
}

同样适用于其他方法