Eclipse error Editor does not contain a main type

Question

I can t seem to run the following code in Eclipse  I do have a main method and this is the currently opened file  I even tried the  Run As  option but I keep getting this error   editor does not contain a main type   What am I doing wrong here    public class cfiltering                    param args                remember this is just a reference       this is a 2d matrix i e  user movie     private static int user movie matrix             remember this is just a reference       this is a 2d matrix i e  user user and contains       the similarity score for every pair of users      private float user user matrix             public cfiltering                   this is default constructor  which just creates the following            ofcourse you need to overload the constructor so that it takes in the dimensions            this is 2d matrix of size 1 1         user movie matrix new int 1  1             this is 2d matrix of size 1 1         user user matrix new float 1  1              public cfiltering int height  int width                user movie matrix new int height  width           user user matrix new float height  height               public static void main String   args              1 0 this is where you open read file           2 0 read dimensions of number of users and number of movies           3 0 create a 2d matrix i e  user movie matrix with the above dimensions             4 0 you are welcome to overload constructors i e  create new ones             5 0 create a function called calculate similarity score            you are free to define the signature of the function           The above function calculates similarity score for every pair of users           6 0 create a new function that prints out the contents of user user matrix           try                         fileinputstream just reads in raw bytes               FileInputStream fstream   new FileInputStream  inputfile txt                   because fstream is just bytes  and what we really need is characters  we need               to convert the bytes into characters  This is done by InputStreamReader               BufferedReader br   new BufferedReader new InputStreamReader fstream                int numberOfUsers Integer parseInt br readLine                 int numberOfMovies Integer parseInt br readLine                    Now you have numberOfUsers and numberOfMovies to create your first object                 this object will initialize the user movie matrix and user user matrix               new cfiltering numberOfUsers  numberOfMovies                  this is a blankline being read             br readLine                String row              int userNo   0              while   row   br readLine       null                                     now lets read the matrix from the file                 String allRatings   row split                       int movieNo   0                  for  String singleRating allRatings                                        int rating Integer parseInt singleRating                         now you can start populating your user movie matrix                     System out println rating                       user movie matrix userNo  movieNo  rating                         movieNo                                       userNo                                  catch Exception e                        System out print e getMessage

User · Answer

Did you import the packages for the file reading stuff.

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;

also here

cfiltering(numberOfUsers, numberOfMovies);

Are you trying to create an object or calling a method?

also another thing:

user_movie_matrix[userNo][movieNo]=rating;

you are assigning a value to a member of an instance as if it was a static variable also remove the Th in

private int user_movie_matrix[][];Th

Hope this helps.

User · Answer

private int user movie matrix     Th  should be  private int user movie matrix        private int user movie matrix      should be private static int user movie matrix       cfiltering numberOfUsers  numberOfMovies   should be new cfiltering numberOfUsers  numberOfMovies    Whether or not the code works as intended after these changes is beyond the scope of this answer  there were several syntax scoping errors

User · Answer

Try closing and reopening the file  then press Ctrl F11   Verify that the name of the file you are running is the same as the name of the project you are working in  and that the name of the public class in that file is the same as the name of the project you are working in as well   Otherwise  restart Eclipse  Let me know if this solves the problem  Otherwise  comment  and I ll try and help

[java] Eclipse error: "Editor does not contain a main type"

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