Answer:
Here is the JAVA application that determines which if any of the following files are stored in folder where you have saved the exercises created.
import java.nio.file.*;   // used to manipulate files and directories
import java.nio.file.attribute.*;  //used to provide access to file and file attributes
import static java.nio.file.AccessMode.*;  // provides access modes to test the accessibility of a file
import java.io.IOException;  //for exception handling
class FindSelectedFiles {
public static void main(String[] args) {
//start of main function
    Path f1 = Paths.get("/root/sandbox/autoexec.bat");
//creates Path object f1 using Paths.get() method and this instance contains the file name and directory list used to construct the specified path
    Path f2 = Paths.get("/root/sandbox/CompareFolders.java");  //creates Path object f2 using Paths.get() method and this instance contains the file name and directory list used to construct the specified path
    Path f3 = Paths.get("/root/sandbox/FileStatistics.class");   //creates Path object f3 using Paths.get() method and this instance contains the file name and directory list used to construct the specified path
    Path f4 = Paths.get("/root/sandbox/Hello.doc"); //creates Path object f4 using Paths.get() method and this instance contains the file name and directory list used to construct the specified path
    int count=0; //used to count the number of files found  
 try{  // used to define a code chunk to be tested for errors 
  f1 = Paths.get("/root/sandbox/autoexec.bat");  // Converts a path string when joined form a path string to a Path
  System.out.println(f1);  //prints the file 
      /* getFileSystem method is used to return the file system that created this Path object f1 and checkAccess Verifies access and throws exception if something is wrong 
  f1.getFileSystem().provider().checkAccess(f1);   
  System.out.println(f1 +" File Exists\n");  //if file exists then displays this message
  count++;  }  //adds 1 to the count of number of files found
  catch (IOException e) {  //a code chunk to be executed if error occurs in the try part
  	System.out.println("File Doesn't Exist\n");	}  //if file not found displays this message
    
 try{  //works same as above try block but for 2nd folder and object f2
  f2 = Paths.get("/root/sandbox/CompareFolders.java");
  System.out.println(f2);
  f2.getFileSystem().provider().checkAccess(f2);
  System.out.println(f2 +" File Exists\n");
  count++;  }
  catch (IOException e) {
  	System.out.println("File Doesn't Exist\n");	}
    
 try{  //works same as above try block but for 3rd folder and object f3
  f3 = Paths.get("/root/sandbox/FileStatistics.class");
  System.out.println(f3);
  f3.getFileSystem().provider().checkAccess(f3);
  System.out.println("File Exists\n");
  count++;	}
  catch (IOException e) {
  	System.out.println("File Doesn't Exist\n");	}
    
 try{  //works same as above try block but for 4th folder and object f4
     f4 = Paths.get("/root/sandbox/Hello.doc");
     System.out.println(f4);
  f4.getFileSystem().provider().checkAccess(f4);
  System.out.println(f4 +" File Exists\n");
  count++; }
  catch (IOException e) {
  	System.out.println("File Doesn't Exist\n");	}
    
    System.out.println(count+" of the files exist");  }  } //displays the number of files found
Explanation:
If you want to directly pass the file name as argument to Paths.get() method then you can use the following code:
    Path f1 = Paths.get("autoexec.bat");
    Path f2 = Paths.get("CompareFolders.java");
    Path f3 = Paths.get("FileStatistics.class");
    Path f4 = Paths.get("Hello.doc");
 The program determines if any, of the files from autoexec.bat, CompareFolders.java, FileStatistics.class, and Hello.doc. are stored in the folder. If a file is found then the program displays the message File exists and add 1 to the count variable each time a file is found. If all the files are found then the program returns the count as 4 otherwise the program display the number of files found by displaying the computed final value of count in the output. Lets say all the files are found then the output of the above program is:
autoexec.bat                                                                                                                                                  
autoexec.bat File Exists  
                                                                                                                                                       CompareFolders.java                                                                                                                                            CompareFolders.java File Exists                                                      
                                                                                                                                                          FileStatistics.class                                                                                                                                          
File Exists                                                                                        
                                                                                                                                                      Hello.doc                                                                                                                                                      Hello.doc File Exists  
    
4 of the files exist