Copy stdin to stdout in Java

inout.java

import java.io.IOException;

/**
 * Class that copies stdin to stdout, as compained about as not being cleanly
 * writable in Java on Hacker News.
 * In real code, you would just write IOUtils.copy(System.in, System.out),
 * which does basically the same thing.
 * This does not catch any exceptions as a) this is just an "exercise" and
 * b) all we could do with them is pretty-print them. So let the runtime 
 * print them for you.
 *
 * Usage: javac inout.java && echo -e "foo\nbar" | java InOut
 */
class InOut {
    public static void main(String[] args) throws IOException {
        byte[] buffer = new byte[8192];
        while(true) {
            int bytesRead = System.in.read(buffer);
            if (bytesRead == -1) {
                return;
            }
            System.out.write(buffer, 0, bytesRead);
        }
    }
}

in bash:
echo

In French:

Copiez entrée à la sortie

In Go:

io.Copy(os.Stdout, os.Stdin)

Libraryless:

b := make([]byte, 1024)
for n, err := os.Stdin.Read(b); err == nil; n, err = os.Stdin.Read(b) {
    os.Stdout.Write(b[:n])
}

In Turkish:

Girdiyi çıktıya aktar.

uhh I dont understand why this isnt a valid solution 

import java.util.Scanner; 

public class Main
{

  public static void main (String[]args) 
  {
    while(true)
    {
        Scanner sc = new Scanner(System.in);
        System.out.println(sc.nextLine());
    }
  }
}