Question

我必须添加文件中的数字并平均它们的总和，并计算单词的数量。到目前为止，我有这个，但我得到一个错误，我得到了这个。我试图让它区分单词和字母，但是在第一次运行时出现错误

import javax.swing.JOptionPane;
import java.util.Scanner;
import java.io.*;
  public class ReadTextFile
{
public static void main (String[] args) throws IOException
{
   String word, line, message, message2;
  int number=0 , numword=0, numnum, numnum2, numnum3, av;
  FileInputStream fis = new  
FileInputStream("C:\\Users\\Douglas\\Desktop\\payroll.txt");
  Scanner in = new Scanner (fis);  

  while (in.hasNext())
  {
     numword++;

     word = in.next();

     message2 = "The word is: "+word+"\n";

     JOptionPane.showMessageDialog (null, message2);
  }  
  in.close();

  while(in.hasNextInt())
  {  
     numnum = in.nextInt();

     number++; 

     message = "The  number is: "+numnum+"\n";

     numnum2=numnum;

     numnum3= numnum+numnum2;

     JOptionPane.showMessageDialog (null, message);

     av=numnum3/number;
  }
  in.close();

  message = "The number of words processed was "+numword;

  JOptionPane.showMessageDialog (null, message);

  message2 = "The number of numbers processed was "+number+"and the average 
  was "+av;

} 
}

Answer 1

您在第一次循环后关闭扫描仪。然后在第二个循环中再次使用它。完成所有扫描后，删除第一个关闭并关闭扫描仪。

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Simple Collapsible</h2>
  <button type="button" class="btn btn-info" data-toggle="collapse" data-target="#first">Simple collapsible</button>
  <div id="first" class="collapse">
      FIRST
  </div> 
<br>
 <button type="button" class="btn btn-info" data-toggle="collapse" data-target="#second">Simple collapsible</button>
  <div id="second" class="collapse">
     SECOND
  </div>
</div>

</body>
</html>

Answer 2

我让代码更具可读性并且正在尝试。

import javax.swing.JOptionPane;
import java.util.Scanner;
import java.io.*;

public class ReadTextFile {
public static void main(String[] args) throws IOException {
    String message, message2;
    int number = 0, numnum =0, sum=0;
    double av = 0.0;
    FileInputStream fis = new FileInputStream("C:\\temp\\file.txt");
    Scanner in = new Scanner(fis);

    while (in.hasNext()) {
        number++;
        numnum = in.nextInt();
        message = "The  number is: " + numnum + "\n";
        JOptionPane.showMessageDialog(null, message);

        sum += numnum;
        av = sum / number;
    }

    message = "The number of words processed was " + number + " total is " +sum;

    JOptionPane.showMessageDialog(null, message);

    message2 = "The number of numbers processed was " + number
            + " and the average was " + av;
    JOptionPane.showMessageDialog(null, message2);

 }
}

添加数字并计算文件中的单词

2 个答案: