Stream Copier : Stream « File « Java Tutorial

1. Java Tutorial
2. File
3. Stream

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class MainClass {

  public static void main(String[] args) {
    try {
      copy(System.in, System.out);
    } catch (IOException ex) {
      System.err.println(ex);
    }

  }

  public static void copy(InputStream in, OutputStream out) throws IOException {

    byte[] buffer = new byte[1024];
    while (true) {
      int bytesRead = in.read(buffer);
      if (bytesRead == -1)
        break;
      out.write(buffer, 0, bytesRead);
    }
  }
}