My Java program has a FileSystemException error

Question

I have a project that is supposed to read a file for lines of code, detects those lines of code and then gives the user the option to delete the code if it exists.

However, my code is running into some issues. It is unable to delete the file but gives the following error:

The process cannot access the file because it is being used by another process.

Here is my code:

import java.util.Scanner;

import java.io.File;

import java.io.IOException;

import java.awt.Desktop;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.io.BufferedReader;

import javax.swing.JOptionPane;

import java.nio.file.*;

class mtd_Scan_Files{

  public static void main(String[] args)
  {

    try{
    double count = 0, countBuffer=0,countLine=0;
    Scanner scan = new Scanner(System.in);
    File virusfile2 = new File("F:\\Users\\Matthew\\virusfile2.txt");
    String name = "virusfile2.txt";
    BufferedReader br;
    boolean exists2 = virusfile2.exists();
    Scanner filereader = new Scanner(virusfile2);
    String maliciouscode = "deletesystem32";
    String maliciouscode2 = "downloadmoreram";
    String maliciouscode3 = "helloworld";
    String line = "";
    int x = 0;
    int y = 0;
    int z = 0; //These three integers are flag variables used to indicate if the malicious code exists
    try{     
      if(exists2 || virusfile2.exists()){   
        try{
          br = new BufferedReader(new FileReader(virusfile2));
          try{
            while((line = br.readLine()) != null){
              countLine++;
              String[] numberlines = line.split(" ");
              for(String word : numberlines){
                if(word.equals(maliciouscode)){
                  x++; //Increase the flag variable by one for every time the maliciouscode is found in the document
                }
                else if(word.equals(maliciouscode2)){
                  y++;//Increase the flag variable by one for every time the maliciouscode2 is found in the document
                }
                else if(word.equals(maliciouscode3)){
                  z++;//Increase the flag variable by one for every time the maliciouscode3 is found in the document
                }
              }
          }
        }
        catch(Exception e){
          e.printStackTrace();
        }
        }
        catch(Exception e){
          e.printStackTrace();
        }
  }

    else{
      JOptionPane.showMessageDialog(null, "virusfile2 does not exist on this computer", "Java Antivirus - DOES NOT EXIST!",
                                        JOptionPane.INFORMATION_MESSAGE);
    }

   }

    catch(Exception e){

      e.printStackTrace();

      }
    if(x == 0 && y == 0 && z == 0){

      JOptionPane.showMessageDialog(null, "This file is clean of malicious code", "Java Antivirus - CLEAN!",
                                        JOptionPane.INFORMATION_MESSAGE);
    }
    else{
      int m = JOptionPane.showConfirmDialog(null, 
             "virusfile2.txt contains the following malicious phrases:\n deletesystem32: " + x + "\n downloadmoreram: " + y + "\n hellowworld: " + z + "\n Do you want Java Antivirus to remove it?",
              "Java Antivirus - WARNING!", JOptionPane.YES_NO_OPTION);
      if(m == 0){
        try{
          virusfile2.delete();
          Path malwarepath = Paths.get("F:\\Users\\Matthew\\virusfile2.txt");
          Files.delete(malwarepath);
          JOptionPane.showMessageDialog(null, "Virus file was removed!", "Java Antivirus - REMOVED!",
                                        JOptionPane.INFORMATION_MESSAGE);
        }
        catch(Exception e){
          e.printStackTrace();
        }
      }
      else{
        JOptionPane.showMessageDialog(null, "Virus file was not removed!", "Java Antivirus - NOT REMOVED!",
                                        JOptionPane.INFORMATION_MESSAGE);
      }
    }
    }
    catch(FileNotFoundException e){
      JOptionPane.showMessageDialog(null, "virusfile2 does not exist on this computer", "Java Antivirus - DOES NOT EXIST!",
                                        JOptionPane.INFORMATION_MESSAGE);
    }
   }
}  

Answer 1

So, I found out that I was using two methods to open the file: The BufferedReader and the Scanner methods. I was closing the BufferedReader, but I wasn't closing the Scanner. Since the scanner was unnecessary in the first place, I just deleted it.

Answer 2

if the file is open , close it and then run your program