eclipse - Java- reading from .data files -

i'm having couple of problems setting system read data java program 2 .data files...

i'm using eclipse ide, , have created project in folder 2 .data files want use. i've started project, still @ beginning...

the 2 .data files are: car.data , owner.data, , have start project.

i've created few classes: owner.java, car.java , readfile.java (to read data .data files).

at present, owner.java file looks this:

import java.io.*;  public class owner {  public static void main(string[] args) throws ioexception {     // todo auto-generated method stub     readfile rf = new readfile("owner.data");     rf.read("owner.data");  } file f; public string id; public string lastname; public string firstname; public string street; public string city;  public void readowner() throws filenotfoundexception{     //file f = new file("smart stream associate software engineer (java) - bristol/assessment/src/owner.java");     //inputstream = new fileinputstream(f); }  } 

my car.java file looks this:

public class order {  public string orderid; public string orderno; public string personid;   } 

and readfile.java file looks this:

import java.io.*;  public class readfile { string[] columns = new string[]{"personid", "lastname", "firstname", "street", "city"}; string[] data = new string[100];  public void read() throws ioexception{     filereader fr = new filereader("person.data");     bufferedreader br = new bufferedreader(fr);     string line;      int = 0;     while((line = br.readline())!= null){         data[i] = line;         system.out.println(data[i]);         i++;     }     br.close();      string[] datanew = new string[i];     system.arraycopy(data, 0, datanew, 0, i);     data = datanew;     system.out.println("data length: " + data.length); } } 

currently, when try run program owner.java class (as that's main method is), i'm getting exception says:

exception in thread "main" java.lang.error: unresolved compilation problems:  constructor readfile(string) undefined method read() in type readfile not applicable arguments (string) 

the line it's complaining line:

readfile rf = new readfile("owner.data"); 

could point out me why i'm getting exception, , i've forgotten avoid getting it? many in advance.

edit 25/09/2013

so, i've tried editing code reflect changes suggested @sushain97 below, , have 'owner.java class looks this:

import java.io.*;  public class person {  public static void main(string[] args) throws ioexception {     // todo auto-generated method stub     readfile rf = new readfile("owner.data");     rf.read();  } file f; public string id; public string lastname; public string firstname; public string street; public string city;  public void readperson() throws filenotfoundexception{     //file f = new file("smart stream associate software engineer (java) - bristol/assessment/src/person.java");     //inputstream = new fileinputstream(f); }  } 

and readfile.java class looks this:

import java.io.*;  public class readfile { //file file; string[] columns = new string[]{"personid", "lastname", "firstname", "street", "city"}; string[] data = new string[100]; private file file;   public readfile(string filename){     this.file = new file(filename);  }  public void read() throws ioexception{     filereader fr = new filereader(file);     bufferedreader br = new bufferedreader(fr);     string line;      int = 0;     while((line = br.readline())!= null){         data[i] = line;         system.out.println(data[i]);         i++;     }     br.close();      string[] datanew = new string[i];     system.arraycopy(data, 0, datanew, 0, i);     data = datanew;     system.out.println("data length: " + data.length); } } 

however, when run code owner.java class, i'm getting error says:

exception in thread "main" java.io.filenotfoundexception: owner.data (the system cannot find file specified)

and

at java.io.fileinputstream.open(native method) @ java.io.fileinputstream.<init>(unknown source) @ java.io.filereader.<init>(unknown source) @ readfile.read(readfile.java:15) @ person.main(owner.java:8) 

i assume means cannot find 'owner.data' file- file stored in same folder 'owner.java' , 'readfile.java' classes stored... ideas why cannot find file, , how can ensure does?

edit 25/09/2013 @ 09:45

i've edited code show changes suggested planetsaro in answer, understand them, have:

import java.io.*; import java.util.scanner;  public class readfile { static file file; string[] columns = new string[]{"personid", "lastname", "firstname", "street", "city"}; string[] data = new string[100];  private static void readfile(string filename){     try{         file file = new file("person.data");         scanner scanner = new scanner(file);         while(scanner.hasnextline()){             system.out.println(scanner.nextline());         }     scanner.close();     } catch (filenotfoundexception e){         e.printstacktrace();     }  }  public void read(file file2) throws ioexception{     filereader fr = new filereader("person.data");     bufferedreader br = new bufferedreader(fr);     string line;      int = 0;     while((line = br.readline())!= null){         data[i] = line;         system.out.println(data[i]);         i++;     }     br.close();      string[] datanew = new string[i];     system.arraycopy(data, 0, datanew, 0, i);     data = datanew;     system.out.println("data length: " + data.length); } } 

but i'm still getting error says exception in thread "main" java.io.filenotfoundexception: owner.data (the system cannot find file specified)

i don't understand why is?

edit 25/09/2013 @ 10:35

ok, can't seem working of answers have been given far (that may because don't understand answers- i've commented on them effect, if case, please explain them more (or basically- beginner).

however, have managed reduce amount of errors being displayed in console when run program. 2 classes this:

readfile.java:

import java.io.*; import java.util.scanner;  public class readfile { static file file; string[] columns = new string[]{"personid", "lastname", "firstname", "street", "city"}; string[] data = new string[100];  private static void readfile(file){     try{         file file = new file("d:\\users\\elgan frost\\desktop\\careers\\smart stream associate software engineer (java) - bristol\\assessment\\srcperson.data");         scanner scanner = new scanner(file1);         while(scanner.hasnextline()){             system.out.println(scanner.nextline());         }     scanner.close();     } catch (filenotfoundexception e){         e.printstacktrace();     }  }  public void read(file file2) throws ioexception{     filereader fr = new filereader("d:\\users\\elgan frost\\desktop\\careers\\smart stream associate software engineer (java) - bristol\\assessment\\srcperson.data");     bufferedreader br = new bufferedreader(fr);     string line;      int = 0;     while((line = br.readline())!= null){         data[i] = line;         system.out.println(data[i]);         i++;     }     br.close();      string[] datanew = new string[i];     system.arraycopy(data, 0, datanew, 0, i);     data = datanew;     system.out.println("data length: " + data.length); } } 

person.java:

import java.io.*;  public class person {  public static void main(string[] args) throws ioexception {     // todo auto-generated method stub     readfile rf = new readfile();     rf.read(readfile.file);  } static file f; public string id; public string lastname; public string firstname; public string street; public string city;  public void readperson() throws filenotfoundexception{     //file f = new file("smart stream associate software engineer (java) - bristol/assessment/src/person.java");     //inputstream = new fileinputstream(f); }  } 

i getting 1 console error, says:

"exception in thread "main" java.lang.error: unresolved compilation problems: syntax error on token "file", variabledeclaratorid expected after token file cannot resolved type"

and complaining line 9 in readfile.java, line:

private static void readfile(file){ 

and line 7 in person.java, line:

readfile rf = new readfile(); 

anyone have ideas why is, , how can put right?

it because, readfile object not have constructor argument string type , method read() not have argument of type string passed in.