[RESOLVED] Java Program Copy Files

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I need to create a program that copies files from a directory to another directory. Then the copied files in the destination directory are to be renamed to their SHA1 hash code. Also, at the same time a new text file is created in the destination directory that contains the file names of the copied files with their SHA1 has code.
Right now I copying contents from the source directory to the destination directory works.
I am really confused and need help.
Here's what I have so far:

import java.io.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

public class Main
{
    public static void main(final String[] args)throws IOException
    {
    	Main cd = new Main();
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Enter the source directory or file name : ");
		String source = in.readLine();
		File src = new File(source);
		System.out.println("Enter the destination directory or file name : ");
		String destination = in.readLine();
		File dst = new File(destination);
		cd.copyDirectory(src, dst);

        File f;
        f = new File("manifest.txt");
        if(!f.exists())
        {
            f.createNewFile();
        }

	}

	public void copyDirectory(File srcPath, File dstPath) throws IOException{
		if (srcPath.isDirectory())
		{
			if (!dstPath.exists())
			{
				dstPath.mkdir();
			}

			String files[] = srcPath.list();
			for(int i = 0; i < files.length; i++)
			{
				copyDirectory(new File(srcPath, files[i]), new File(dstPath, files[i]));
			}
		}
		else
		{
			if(!srcPath.exists())
			{
				System.out.println("File or directory does not exist.");
				System.exit(0);
			}
			else
			{
				InputStream in = new FileInputStream(srcPath);
		        OutputStream out = new FileOutputStream(dstPath);

				// Transfer bytes from in to out
		        byte[] buf = new byte[1024];
				int len;
		        while ((len = in.read(buf)) > 0) {
					out.write(buf, 0, len);
				}
				in.close();
		        out.close();
			}
		}
		System.out.println("Directory copied.");
	}
}