how to read a text file using scanner in Java

Question

This is my code to read a text file  When I run this code  the output keeps saying  File not found    which is the message of FileNotFoundException  I m not sure what is the problem in this code   Apparently this is part of the java  For the whole java file  it requires the user to input something and will create a text file using the input as a name  After that the user should enter the name of the text file created before again  assume the user enters correctly  and then the program should read the text file  I have done other parts of my program correctly  but the problem is when i enter the name again  it just can not find the text file  eventhough they are in the same folder   public static ArrayList lt DogShop gt  readFile                  try                 The name of the file which we will read from             String filename    a txt                   Prepare to read from the file  using a Scanner object             File file   new File filename               Scanner in   new Scanner file                ArrayList lt DogShop gt  shops   new ArrayList lt DogShop gt                     Read each line until end of file is reached             while  in hasNextLine                                     Read an entire line  which contains all the details for 1 account                 String line   in nextLine                        Make a Scanner object to break up this line into parts                 Scanner lineBreaker   new Scanner line                         1st part is the account number                 try                      int shopNumber   lineBreaker nextInt                            2nd part is the full name of the owner of the account                     String owner   lineBreaker next                            3rd part is the amount of money  but this includes the dollar sign                     String equityWithDollarSign   lineBreaker next                         int total   lineBreaker nextInt                            Get rid of the dollar sign                         we use the subtring method from the String class  see the Java API                          which returns a new string with the first  n  characters chopped off                         where  n  is the parameter that you give it                     String equityWithoutDollarSign   equityWithDollarSign substring 1                           Convert this balance into a double  we need this because the deposit method                        in the Account class needs a double  not a String                     double equity   Double parseDouble equityWithoutDollarSign                           Create an Account belonging to the owner we found in the file                     DogShop s   new DogShop owner                             Put money into the account according to the amount of money we found in the file                     s getMoney equity                            s getDogs total                           Put the Account into the ArrayList                     shops add s                                      catch  InputMismatchException e                                        System out println  File not found1                                         catch  NoSuchElementException e                                        System out println  File not found2                                                             catch  FileNotFoundException e                        System out println  File not found                    Make an ArrayList to store all the accounts we will make                    Return the ArrayList containing all the accounts we made         return shops

User · Answer

Just another thing    Instead of  System out println  Error Message Here    use System err println  Error Message Here    This will allow you to distinguish the differences between errors and normal code functioning by displaying the errors i e  everything inside System err println    in red   NOTE  It also works when used with System err print  Error Message Here

User · Answer

This should help you     import java io    import static java lang System          Write a description of class InRead here        author  your name      version  a version number or a date     public class InRead   public InRead String Recipe        find Recipe     public void find String Name       String newRecipe  Name   txt       try          FileReader fr  new FileReader newRecipe           BufferedReader br  new BufferedReader fr            String str        while   str br readLine       null               out println str     n                      br close          catch  IOException e           out println  File Not Found

User · Answer

If you are working in some IDE like Eclipse or NetBeans  you should have that a txt file in the root directory of your project   and not in the folder where your  class files are built or anywhere else   If not  you should specify the absolute path to that file     Edit  You would put the  txt file in the same place with the  class usually also the  java file because you compile in the same folder  compiled files if you compile it by hand with javac  This is because it uses the relative path and the path tells the JVM the path where the executable file is located   If you use some IDE  it will generate the compiled files for you using a Makefile or something similar for Windows and will consider it s default file structure  so he knows that the relative path begins from the root folder of the project

User · Answer

If you give a Scanner object a String  it will read it in as data  That is   a txt  does not open up a file called  a txt   It literally reads in the characters  a         t  and so forth   This is according to Core Java Volume I  section 3 7 3   If I find a solution to reading the actual paths  I will return and update this answer  The solution this text offers is to use  Scanner in   new Scanner Paths get  myfile txt       But I can t get this to work because Path isn t recognized as a variable by the compiler  Perhaps I m missing an import statement

User · Answer

I would recommend loading the file as Resource and converting the input stream into string  This would give you the flexibility to load the file anywhere relative to the classpath

User · Answer

Well   Apparently the file does not exist or cannot be found  Try using a full path  You re probably reading from the wrong directory when you don t specify the path  unless a txt is in your current working directory

[java] how to read a text file using scanner in Java?

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