Java Program to create an File and if exists then the user will have the choice to Replace that File or not

import java.io.*;
import java.util.*;
import system.*;
public class ReplaceFiles{
    Scanner scan=new Scanner(System.in);
    String fileName;
    char ch;
    public void input(){
        try{
            System.out.printf("Enter File Name: ");
            fileName=scan.nextLine();
            ReplaceFiles();
        }
        catch(InputMismatchException e){
            System.err.println("Error Occured!\n"+e.getMessage());
            System.exit(0);
        }
    }

    public void ReplaceFiles(){
        try{
            DesktopPath path=new DesktopPath();
            String desktop="";
            desktop=path.getDesktopAccutualPath();
            File file=new File(desktop+"\\"+fileName+".txt");
            if(!file.exists())
                file.createNewFile();
            else{
                System.out.printf("File already exists!\nDo you want to replace it Y/N? ");
                fileName=scan.next();
                ch=fileName.charAt(0);
                if(ch=='Y' || ch=='y')
                    file.createNewFile();
                else if(ch=='N' || ch=='n'){
                    System.out.println("File not Replaced!");
                    System.exit(0);
                }
                else{
                    System.err.println("Illegal Character Used!");
                    System.exit(0);
                }
            }
            if(file.exists()){
                System.out.println("Enter you text and save it!");
                Process run=Runtime.getRuntime().exec("notepad.exe "+file);
            }
            else
                System.err.println("File not created!");
            System.exit(0);
        }
        catch(IOException e){
            System.err.println("Error Occured!\n"+e.getMessage());
            System.exit(0);
        }
    }

    public static void main(String[] args){
        ReplaceFiles obj=new ReplaceFiles();
        obj.input();
    }
}