Question

目标是询问每个州的国会大厦是什么，说明是对还是错，然后在最后给出正确答案的总数。编译它时没有给我任何错误，但是当我尝试运行它时它会说： java.uitl.NoSuchElementException：找不到行（在java.util.Scanner中）

可能还有更多的错误，但我宁愿只关注这个错误。任何反馈都将不胜感激，谢谢！

代码：

 import java.util.*;
import java.io.*;
public class States
{
    public static void main(String[] args)
    throws java.io.IOException
     {
        Scanner inputt = new Scanner (System.in);
        String[][] cs = new String [50][1];
        while (true)
        {
            String in = " ";
            boolean ans = false;
            int tally = 0;
            int count = 0;
            load(cs);
            in = input(count, cs);
            ans = check(in, count, cs);
            if (ans == true)
            {
                tally ++;
                continue;
            }
            count= count +2;
            if (count > 100)
            {
                System.out.println("The count of correct answers is " + tally + ".");
                break;
            }
        }//end main method while loop
     }//end main method
    public static void load(String[][] cs)
    throws java.io.IOException
    {
       String filName = " ";
       filName = "C://Users/Troy/Documents/Class Documents/CSC 225/StateCapitals.txt";
       Scanner inputt = new Scanner(new File(filName));
       for (int row = 0; row < cs.length; row ++)
       {
           for (int col = 0; col < cs[row].length; col ++)
           {
           cs[row][col] = inputt.nextLine();
        }
        }//end for loop
        inputt.close();
    }//end load method
    public static String input(int count, String[][] cs)
    {
        Scanner inputt = new Scanner (System.in);
        System.out.print("What is the capital of " + cs[count][0] + "? -");
        String t = inputt.nextLine().trim().toUpperCase();
        return t;
    }//end input method
    public static Boolean check(String in, int count, String [][] cs)
    {
      boolean correct = false;
      if (cs[count +1][0].compareTo(in)==0)
      {
          correct=true;
          System.out.println("Your answer is correct.");
        }
       else
       {
         System.out.println("The correct answer should be " + cs[count + 1][0]);
        }
        return correct;
    }//end check method
}//end class

Answer 1

您没有在加载方法的开头使用扫描仪类正确读取文件。

尝试使用类似的东西

ArrayList<String> lines = new ArrayList<>();

JOptionPane.showMessageDialog(null, "Please choose a file");        
JFileChooser input = new JFileChooser();
int a = input.showOpenDialog(null);
String file = "";

if (a == JFileChooser.APPROVE_OPTION) {
    File selectedFile = input.getSelectedFile();
    file = selectedFile.getPath();
}

//use file input to read in line one at a time
FileInputStream fstream = new FileInputStream(file);
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String line;
while ((line = br.readLine()) != null) {
    lines.add(line);
}

或者，如果您想使用Scanner类，可以使用类似

的内容

// Location of file to read
File file = new File("data.txt");

try {
    Scanner scanner = new Scanner(file);

    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        System.out.println(line);
    }
    scanner.close();
} 

catch (FileNotFoundException e) {
        e.printStackTrace();
}

初学Java程序员苦苦挣扎（找不到行）

1 个答案: