Reading file using java

Question

I'm trying to read a txt file using this code.

This is my function which reads the file:

public class Open_File {        
    public void fct(File file) throws IOException {    
        String line = null;
        FileReader fr = null;
        {
            try
            {
                fr = new FileReader( file );
            } 
            catch (FileNotFoundException e) 
            {  
                System.out.println( "File doesn't exists" );
                e.printStackTrace();
            }
            BufferedReader br = new BufferedReader( fr );

            try
            {
                while( (line = br.readLine()) != null )
                {
                    System.out.println( line );
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            finally{
                br.close();
            }
        }
    }
}

And this is my main function, where I give the path:

public static void main(String[] args) throws IOException {
    Open_File o = null;
    File file= new File("C:/test.txt");
    o.fct(file);
    System.out.println("réussi");
}

The problem is that the execution throws a NullPointerException

Exception in thread "main" java.lang.NullPointerException
    at test.main(test.java:17)

Please could anyone give me a solution for this problem.

score 2 · Accepted Answer · answered Dec 31 '15 at 08:33

2

You are never assigning anything to o other than null. You need to change this line: Open_File o = null; to Open_File o = new Open_File();.

answered Dec 31 '15 at 08:33

npinti

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you have right , it works now , thank you a lot :) :) :) – user3531649 Dec 31 '15 at 08:37

Reading file using java

1 Answers1