Question

计数一直保持为零。我只是尝试阅读文本文件并查找单词，并将计数显示给用户。

我不知道它在哪里分崩离析。我认为是If语句，但不确定语法出错的地方。谢谢你的帮助！

import java.io.File;
import java.io.FileNotFoundException;
import java.util.*;

import javax.swing.*;

public class TextSearchFromFile 
{
public static void main(String[] args) throws FileNotFoundException 
{

    boolean run = true;
    int count = 0;


            //greet user
        JOptionPane.showMessageDialog(null, 
                "Hello, today you will be searching through a text file on the harddrive. \n"
                + "The Text File is a 300 page fantasy manuscript written by: Adam\n"
                + "This exercise was intended to have the user enter the file, but since \n"
                + "you, the user, don't know which file the text to search is that is a \n"
                + "bit difficult.\n\n"
                + "On the next window you will be prompted to enter a string of characters.\n"
                + "Feel free to enter that string and see if it is somewhere in 300 pages\n"
                + "and 102,133 words. Have fun.", 
                "Text Search", 
                JOptionPane.PLAIN_MESSAGE);

    while (run)
    {
        try
        {
                //open the file
            Scanner scanner = new Scanner(new File("An Everthrone Tale 1.txt"));

                //prompt user for word
            CharSequence findWord = JOptionPane.showInputDialog(null, 
                    "Enter the word to search for:", 
                    "Text Search", 
                    JOptionPane.PLAIN_MESSAGE);
            count = 0;


            while (scanner.hasNext())
            {

                if ((scanner.next()).contains(findWord))
                {
                    count++;
                }

            } //end search loop


                //output results to user
            JOptionPane.showMessageDialog(null, 
                    "The results of your search are as follows: \n"
                    + "Your String: " + findWord + "\n"
                    + "Was found: " + count + " times.\n"
                    + "Within the file: An Ever Throne Tale 1.txt", 
                    "Text Search",
                    JOptionPane.PLAIN_MESSAGE);
        } //end try
        catch (NullPointerException e)
        {
            JOptionPane.showMessageDialog(null, 
                    "Thank you for using the Text Search.", 
                    "Text Search", 
                    JOptionPane.ERROR_MESSAGE);
            System.exit(0);
        }
    } //end run loop
} // end main
} // end class

编辑：再次需要帮助。教师改变了项目的参数，现在我需要找到像＃34; th＆＃34;或＆＃34; en＆＃34;并计算那些。

这种感觉超出了他所教导的范围，我不知道如何做到这一点。我已经谷歌搜索了，直到我不能谷歌了。

Answer 1

您必须向File提供一个Scanner对象才能阅读该文件，目前所有搜索结果都在字符串中“Everthrone Tale 1.txt”

Scanner scanner = new Scanner(new File("An Everthrone Tale 1.txt"));

要搜索一个单词，你需要这样做：

         while (scanner.hasNext())
         {
             if (findWord.equals(scanner.next()))
             {
                 count++;
             }
        }

如果您要执行 case-insensitive 搜索，请使用String#equalsIgnoreCase代替String#equals

希望这有帮助

计算文本文件中用户指定字符串的出现次数

1 个答案: