I've had this problem a few times, where I've created another class file and the main class file can't find it. 
Here's the main class file:

```
package textfiles;

import java.io.IOException;
 public class FileData
 {

public static void main(String[] args)
{
    String file_name = "Lines.txt";

    try {
        ReadFile file = new ReadFile(file_name);
        String[] aryLines = file.OpenFile();

        for(int i =0; i<aryLines.length; i++)
        {
            System.out.println(aryLines);
        }
    }

    catch(IOException e)
    {   
        System.out.println(e.getMessage());
    }
}
  }

```

Here is the class file it can't find:

```
package textfiles;

import java.io.IOException;
import java.io.FileReader;
import java.io.BufferedReader;

 public class ReadFile
 {
private String path;
int numberOfLines=0;

public ReadFile(String file_path)
{
    path = file_path;
}

public String[] OpenFile() throws IOException
{
    FileReader fr = new FileReader(path);
    BufferedReader br = new BufferedReader(fr);

    int numberOfLines = readLines();
    String[] textData = new String[numberOfLines];

    for(int i=0; i<numberOfLines; i++)
    {
        textData[i] = br.readLine();
    }

    br.close();
    return textData;
}

int readLines() throws IOException
{
    FileReader file_to_read = new FileReader(path);
    BufferedReader bf = new BufferedReader(file_to_read);

    String aLine;

    while((aLine = bf.readLine()) != null)
    {
        numberOfLines++;
    }

    bf.close();
    return numberOfLines;
}
  }

```

I've tried running javac textfiles\ReadFile.java and javac textfiles\FileData.java as a suggestion for [this](https://stackoverflow.com/questions/3903330/cannot-find-symbol-compile-error). That doesn't work. I've made sure I have compiled ReadFile and fixed all the errors there. 
The compiler error I get is:

```
C:\Users\Liloka\Source>javac FileData.java
FileData.java:13: cannot find symbol
symbol  : class ReadFile
location: class textfiles.FileData
                    ReadFile file = new ReadFile(file_name);
                    ^
  FileData.java:13: cannot find symbol
  symbol  : class ReadFile
  location: class textfiles.FileData
                    ReadFile file = new ReadFile(file_name);
                                        ^
  2 errors

```

I'm using notepad++and .cmd so it can't be an IDE error. 
Thanks in advance!