import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public final class MyUtil {



    public static void fileCopy(String source, String target) throws
 
 IOException {
        try (InputStream in = new FileInputStream(source)) {
            try (OutputStream out = new FileOutputStream(target)) {
                byte[] buffer = new byte[4096];
                int bytesToRead;
                while((bytesToRead = in.read(buffer)) != -1) {
                    out.write(buffer, 0
 
, bytesToRead);
                }
            }
        }
    }

    public static void fileCopyNIO(String source, String target) throws IOException {
        try (FileInputStream in = new FileInputStream(source)) {
            try (FileOutputStream out = new FileOutputStream(target)) {
                FileChannel inChannel = in.getChannel();
                FileChannel outChannel = out.getChannel();
                ByteBuffer buffer = ByteBuffer.allocate(4096
 
);
                while(inChannel.read(buffer) != -1) {
                    buffer.flip();
                    outChannel.write(buffer);
                    buffer.clear();
                }
            }
        }
    }

    public static void main(String[] args)
    {

        String source = "C:/MyCode/Java/LeetCode/filetest/source.txt";
        String target = "C:/MyCode/Java/LeetCode/filetest/target.txt";
        MyUtil test = new MyUtil();
        try {
            test.fileCopy(source, target);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }   

    }
}