import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class FileCopy{

	public static void main(String[] args){
		if(isNull(args[0]) || isNull(args[1])){
			System.out.println("args error.");
			return ;
		}
		long start = System.currentTimeMillis();

		if("0".equals(args[1]))
			oldIOCopy(args[0], args[0] + "copy_0");
		else
			newIOCopy(args[0], args[0] + "copy_1");

		System.out.println(System.currentTimeMillis() - start);
	}
	
	static boolean isNull(String str){
		if(null == str || "".equals(str.trim()))
			return true;
		else
			return false;
	}

	static void oldIOCopy(String name, String copy){
		try{
			File f = new File(name);	
			File ftmp = new File(copy);
			
			FileInputStream in = new FileInputStream(f);
			FileOutputStream out = new FileOutputStream(ftmp);

			byte[] buff = new byte[1024];

			int len = 0;
			while((len = in.read(buff)) != -1){
				out.write(buff, 0, len);
			}

			out.close();
			in.close();

		}catch(Exception e){
			System.out.println("Exception.");
		}	
	}

	static void newIOCopy(String name, String copy){
		try{
			FileChannel in = new FileInputStream(new File(name)).getChannel();	
			FileChannel out = new FileOutputStream(new File(copy)).getChannel();

			ByteBuffer buffer = ByteBuffer.allocate(1024);
			
			while(in.read(buffer) != -1){
				buffer.flip(); // Prepare for writing
				out.write(buffer);
				buffer.clear();// Prepare for reading
			}

			out.close();
			in.close();
		}catch(Exception e){
			System.out.println("Exception");
		}	
	}
}