Copying files in java (whole file not getting copied) - object

Question

import java.io.*;
public class ReadFile {
public static void main(String[] args) throws IOException {
File in = new File("in.txt");
//File out = new File("out.txt");
FileOutputStream fos= new FileOutputStream("o.txt");
//PrintWriter fw= new PrintWriter(out);
if(!in.exists())
{
in.createNewFile();
//System.out.println("Hey");
}
FileReader is = new FileReader(in);
BufferedReader br= new BufferedReader(is);
while(true)
{
if(in.canRead())
{
try {
System.out.println(br.readLine());
fos.write((br.readLine()).getBytes());
} catch (Exception e) {
// TODO Auto-generated catch block
fos.close();
br.close();
System.out.println("Im breaking");
break;
}
}
else
{
fos.close();
System.out.println("closed");
break;
)
}
}
}
//end of file
I am trying to copy text from one file to another file in Java.I know we can copy byte by byte but i want to do it using strings! What's wrong?
Actual file :
Output file :

Answer 1

If you working with Java7 you can use Files.copy(source.toPath(), dest.toPath()); so you do not have to read the file. Or use FileUtils.copyFile(source, dest); from apache commons io.

Answer 2

System.out.println(br.readLine());
fos.write((br.readLine()).getBytes());
You
Read one line, print it to stdout
Read another line, write it to fos
Thus some lines may be missing from output file. Also, readLine() drops the line-termination characters. You need to add them back by yourself.