File Operations

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class FileOperations
{
    public static void deleteDirectory(File directory)
    {
        File[] children = directory.listFiles();

        for (int i = 0; i < children.length; i++)
        {
            if (children[i].isFile())
            {
                children[i].delete();
            } else
            {
                deleteDirectory(children[i]);
                children[i].delete();
            }
        }

        directory.delete();
    }

    public static void copyDirectory(File sourceLocation, File targetLocation)
            throws IOException
    {
        if (sourceLocation.isDirectory())
        {
            if (!targetLocation.exists())
            {
                targetLocation.mkdir();
            }

            File[] children = sourceLocation.listFiles();

            for (int i = 0; i < children.length; i++)
            {
                copyDirectory(children[i],
                        new File(targetLocation, children[i].getName()));
            }
        } else
        {
            copyFile(sourceLocation, targetLocation);
        }
    }

    private static void copyFile(File sourceLocation, File targetLocation)
            throws IOException
    {
        InputStream inputStream = new FileInputStream(sourceLocation);
        OutputStream outputStream = new FileOutputStream(targetLocation);

        byte[] buffer = new byte[1024];
        int length;

        while ((length = inputStream.read(buffer)) > 0)
        {
            outputStream.write(buffer, 0, length);
        }

        inputStream.close();
        outputStream.close();
    }
}