Java: Copy contents of directory to other directory

Below snippet copy contents of one directory to another.

private static void cpFolder(File source, File destination) throws IOException {

         if (!source.isDirectory()) {

                  copyFile(source, destination);

                  return;

         }

         if (!destination.exists()) {

                  destination.mkdirs();

         }

         String files[] = source.list();

         for (String file : files) {

                  File srcFile = new File(source, file);

                  File destFile = new File(destination, file);

                  cpFolder(srcFile, destFile);

         }

}

App.java

package com.sample.app;

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 App {

 public static void copyFolder(File source, File destination) throws IOException {
  if (!source.isDirectory() || !source.exists()) {
   return;
  }
  cpFolder(source, destination);
 }

 private static void cpFolder(File source, File destination) throws IOException {

  if (!source.isDirectory()) {
   copyFile(source, destination);
   return;
  }

  if (!destination.exists()) {
   destination.mkdirs();
  }

  String files[] = source.list();

  for (String file : files) {
   File srcFile = new File(source, file);
   File destFile = new File(destination, file);

   cpFolder(srcFile, destFile);
  }

 }

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

  try (InputStream inputStream = new FileInputStream(source);
    OutputStream outputStream = new FileOutputStream(dest);) {

   byte[] buffer = new byte[1024];
   int length;
   while ((length = inputStream.read(buffer)) > 0) {
    outputStream.write(buffer, 0, length);
   }
  }
 }

 public static void main(String args[]) throws IOException {
  File source = new File("/Users/krishna/Documents/TechnicalDocuments/ ");
  File destination = new File("/Users/krishna/Documents/TechnicalDocuments_copy");
  copyFolder(source, destination);
 }
}

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