Here's how you write line returns and tabs.
import java.io.*;
public class WriteFile
{
public static void main(
String args [] )
{
try
{
FileWriter writer = new FileWriter("file.txt");
writer.write("Hello\tWorld\n");
writer.write("!!!\t!!!");
writer.flush();
writer.close();
}
catch ( Exception ex )
{
ex.printStackTrace();
}
}
}