在mian 方法里面
 Scanner keyboard = new Scanner(System.in);
 System.out.print("Enter the filename to read from: ");
 String filename = keyboard.nextLine();
 System.out.print(filename);
      File file = new File(filename);   
 
      StringTokenizer token;      
      while (inputFile.hasNext()){          
      String line = inputFile.nextLine();      
      token = new StringTokenizer(line, "");   
      String firstName = token.nextToken();       
      String lastName = token.nextToken();      
      String IDString = token.nextToken();  
        系统报错为:
            Enter the filename to read from: C:\Users\15220\OneDrive\student_record.txt
 
C:\Users\15220\OneDrive\student_record.txtException in thread "main" java.io.FileNotFoundException: C:\Users\15220\OneDrive\student_record.txt (???????????)
 at java.base/java.io.FileInputStream.open0(Native Method)
 at java.base/java.io.FileInputStream.open(Unknown Source)
 at java.base/java.io.FileInputStream.(Unknown Source)
 at java.base/java.util.Scanner.(Unknown Source)
 at Exercise3.Exercise3.main(Exercise3.java:15)
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OneDrive下的文件,可能不在本地,你最好不要用这个,换一个别的路径,本地存在的文件看看