private static void copyFileUsingFileStreams(File source, File dest)
    throws IOException {  
  InputStream input = null;  
  OutputStream output = null;  
  try {
      input = new FileInputStream(source);
      output = new FileOutputStream(dest);    
      byte[] buf = new byte[1024];    
      int bytesRead;    
      while ((bytesRead = input.read(buf)) > 0) {
        output.write(buf, 0, bytesRead);
      }
  } finally {
    input.close();
    output.close();
  }
}

private static void copyFileUsingFileChannels(File source, File dest) throws IOException {  
    FileChannel inputChannel = null;  
    FileChannel outputChannel = null;  
  try {
    inputChannel = new FileInputStream(source).getChannel();
    outputChannel = new FileOutputStream(dest).getChannel();
    outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
  } finally {
    inputChannel.close();
    outputChannel.close();
  }
}

private static void copyFileUsingApacheCommonsIO(File source, File dest)
    throws IOException {
  FileUtils.copyFile(source, dest);
}

private static void copyFileUsingJava7Files(File source, File dest)
    throws IOException {  
    Files.copy(source.toPath(), dest.toPath());
}

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import org.apache.commons.io.FileUtils;
 
public class CopyFilesExample {
 
  public static void main(String[] args) throws InterruptedException,
      IOException {
 
    File source = new File("C:\\Users\\nikos7\\Desktop\\files\\sourcefile1.txt");
    File dest = new File("C:\\Users\\nikos7\\Desktop\\files\\destfile1.txt");
 
    // copy file using FileStreams
    long start = System.nanoTime();
    long end;
    copyFileUsingFileStreams(source, dest);
    System.out.println("Time taken by FileStreams Copy = "
        + (System.nanoTime() - start));
 
    // copy files using java.nio.FileChannel
    source = new File("C:\\Users\\nikos7\\Desktop\\files\\sourcefile2.txt");
    dest = new File("C:\\Users\\nikos7\\Desktop\\files\\destfile2.txt");
    start = System.nanoTime();
    copyFileUsingFileChannels(source, dest);
    end = System.nanoTime();
    System.out.println("Time taken by FileChannels Copy = " + (end - start));
 
    // copy file using Java 7 Files class
    source = new File("C:\\Users\\nikos7\\Desktop\\files\\sourcefile3.txt");
    dest = new File("C:\\Users\\nikos7\\Desktop\\files\\destfile3.txt");
    start = System.nanoTime();
    copyFileUsingJava7Files(source, dest);
    end = System.nanoTime();
    System.out.println("Time taken by Java7 Files Copy = " + (end - start));
 
    // copy files using apache commons io
    source = new File("C:\\Users\\nikos7\\Desktop\\files\\sourcefile4.txt");
    dest = new File("C:\\Users\\nikos7\\Desktop\\files\\destfile4.txt");
    start = System.nanoTime();
    copyFileUsingApacheCommonsIO(source, dest);
    end = System.nanoTime();
    System.out.println("Time taken by Apache Commons IO Copy = "
        + (end - start));
 
  }
 
  private static void copyFileUsingFileStreams(File source, File dest)
      throws IOException {
    InputStream input = null;
    OutputStream output = null;
    try {
      input = new FileInputStream(source);
      output = new FileOutputStream(dest);
      byte[] buf = new byte[1024];
      int bytesRead;
      while ((bytesRead = input.read(buf)) > 0) {
        output.write(buf, 0, bytesRead);
      }
    } finally {
      input.close();
      output.close();
    }
  }
 
  private static void copyFileUsingFileChannels(File source, File dest)
      throws IOException {
    FileChannel inputChannel = null;
    FileChannel outputChannel = null;
    try {
      inputChannel = new FileInputStream(source).getChannel();
      outputChannel = new FileOutputStream(dest).getChannel();
      outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
    } finally {
      inputChannel.close();
      outputChannel.close();
    }
  }
 
  private static void copyFileUsingJava7Files(File source, File dest)
      throws IOException {
    Files.copy(source.toPath(), dest.toPath());
  }
 
  private static void copyFileUsingApacheCommonsIO(File source, File dest)
      throws IOException {
    FileUtils.copyFile(source, dest);
  }
 
}

Time taken by FileStreams Copy = 127572360
Time taken by FileChannels Copy = 10449963
Time taken by Java7 Files Copy = 10808333
Time taken by Apache Commons IO Copy = 17971677