StringTokenizer 中出现错误的 java 项目

Question

我制作了一个涉及 StringTokenizer 的 java 项目，我使用了文件 FemaleCoursesElec.csv，该文件用逗号分隔，然后我用它来填充 array1 但有一个问题我不知道它是什么？

这是类(class):

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package shakeelprojectmain;

/**
 *
 * @author lenovo
 */
import java.util.*;
import java.io.*;
     
public class ArrayOfCourses {
    
    public String[][] getAllCourses() throws IOException
    {
        
     String[][] array1 = new String[getRow()][getCol()];   
      
     int i = 0; 
     String str;
    
    File file = new File("FemaleCoursesElec.csv");
    Scanner in = new Scanner(file);
    		
		while(in.hasNext())
		{

			str = in.nextLine();
			StringTokenizer token = new StringTokenizer(str,",");
	 		
			while(token.hasMoreTokens())
			{
				for (int j = 0 ; j < getCol() ; j++)
				{
                                
					array1[i][j] = token.nextToken();

				}
			}
			i++;
		}                
    
        in.close();
      
     
     return array1;
    }
    
 
    /**
     *
     * @return
     * @throws java.io.IOException
     */
    public  int getRows() throws IOException 
    {
    int row = 0; 
    
    
    File file = new File("FemaleCoursesElec.csv");
    Scanner in = new Scanner(file);
    
    while(in.hasNext())
    {
     in.nextLine();
     row++;    
        
    }
    
        in.close();
        return row;
    
    }
    
    public int getCol() throws IOException
    {
        
        int col = 0; 
        File file = new File("FemaleCoursesElec.csv");
		Scanner in = new Scanner(file);
		String str = in.nextLine();
		StringTokenizer token;
        token = new StringTokenizer(str,"," );

		while(token.hasMoreTokens())
		{
			token.nextToken();
			col++;
		}

		in.close();
		return col;
    
    }

    private int getRow()  throws IOException 
    {
        
        int row = 0; 
        File file = new File("FemaleCoursesElec.csv");
		Scanner inputFile = new Scanner(file);

		while(inputFile.hasNext())
		{
			inputFile.nextLine();
			row++;
		}
		
		inputFile.close();
		return row;
        
        
        
   
        
        
    }
    }
    

主程序在这里:

package shakeelprojectmain;
import java.io.*;
import java.util.*;

/**
 *
 * @author lenovo
 */
public class ShakeelProjectMain {

    /**
     * @param args the command line arguments
     * @throws java.io.IOException
     */
    public static void main(String[] args) throws IOException {
        
        ArrayOfCourses array11 = new ArrayOfCourses();
        String[][] array1 = array11.getAllCourses();
        
        System.out.println(array1[0][0]+"\n" + array1[0][2]);
        
    }
    
}

但是每次我运行这个程序时，StringTekonizer 都会出现错误？

故障显示如下

Exception in thread "main" java.util.NoSuchElementException
at java.util.StringTokenizer.nextToken(StringTokenizer.java:349)
at shakeelprojectmain.ArrayOfCourses.getAllCourses(ArrayOfCourses.java:40)
at shakeelprojectmain.ShakeelProjectMain.main(ShakeelProjectMain.java:25)

我尝试了很多次来解决这个问题，但都无法解决，我该如何解决这个问题？

Answer 1

这里:

        while(token.hasMoreTokens()) {

保证至少拥有一个 token 。但是，在这里:

            for (int j = 0 ; j < getCol() ; j++) {
                array1[i][j] = token.nextToken();

您迭代了多个。每个 hasMoreTokens() 只能调用一次 nextToken()。