FileCopyMain.java

package me.masahito;

import java.io.*;
import java.nio.channels.FileChannel;

public class FileCopyMain {

    private static void copyFileUsingStream(File source, File dest) throws IOException {

        try(
            InputStream is = new FileInputStream(source);
            OutputStream os = new FileOutputStream(dest)
        ) {
            byte[] buffer = new byte[1024];
            int length;
            while ((length = is.read(buffer)) > 0) {
                os.write(buffer, 0, length);
            }
        }
    }
    private static void copyFileUsingRandomAccessFile(File source, File dest) throws IOException {

        try(
            InputStream is = new FileInputStream(source);
            RandomAccessFile raf = new RandomAccessFile(dest, "rw")
        ) {
            byte[] buffer = new byte[1024];
            int length;
            while ((length = is.read(buffer)) > 0) {
                raf.write(buffer, 0, length);
            }
        }
    }

    private static void copyFileUsingChannel(File source, File dest) throws IOException {

        try (
            FileChannel input = new FileInputStream(source).getChannel();
            FileChannel output = new FileOutputStream(dest).getChannel()
        ) {
            input.transferTo(0, input.size(), output);
        }
    }

    public static void main(String[] args) throws IOException {

        //copy file conventional way using Stream
        final File source = new File("/Users/masahito/tmp/source.data");
        File dest = new File("/Users/masahito/tmp/dest.data");
        long start = System.nanoTime();
        copyFileUsingStream(source, dest);
        System.out.println("Time taken by Stream Copy = "+(System.nanoTime()-start));

        //copy files using InputStream and RandomAccessFile
        dest = new File("/Users/masahito/tmp/destRandomAccessFile.data");
        start = System.nanoTime();
        copyFileUsingRandomAccessFile(source, dest);
        System.out.println("Time taken by RandomAccessFile Copy = "+(System.nanoTime()-start));

        //copy files using java.nio FileChannel
        dest = new File("/Users/masahito/tmp/destChannel.data");
        start = System.nanoTime();
        copyFileUsingChannel(source, dest);
        System.out.println("Time taken by Channel Copy = "+(System.nanoTime()-start));
    }
}

gistfile1.txt

MacBook Pro
10.9
SSDmodel
jdk1.8.0

Time taken by Stream Copy =           6092912000
Time taken by RandomAccessFile Copy = 4220217000
Time taken by Channel Copy =          6136507000