import java.nio.file.*;
import java.io.*;

import java.util.*;
import java.util.stream.*;

public class Examples {
   public static void main(String[] args) throws IOException {
      int[] numbers = {18, 9, 7, 42, 3, 8, 15, 32, 208, 315, 8, 12, 8};
      
      // standard array traversal
      System.out.print("numbers:");
      for (int i = 0; i < numbers.length; i++) {
         System.out.print(" " + numbers[i]);
      }
      System.out.println();
      
      // for each loop
      System.out.print("numbers:");
      for (Integer val : numbers) {
         System.out.print(" " + val);
      }
      System.out.println();
      
      // Java 8 approach involves working with streams
      // streams are of the form: source of data -> modifiers -> terminator
      // functions are specified with a lambda (anonymous function)
      System.out.print("numbers:");
      Arrays.stream(numbers)
            .sorted()
            .distinct()
            .forEach(n -> System.out.print(" " + n));
      System.out.println();

      Files.list(Paths.get(System.getProperty("user.dir")))
            .forEach(n -> sort(n));
    
   }
   
   public static void sort(Path p){
      String parent = p.getParent().toString();
      
      String[] folders = {"jpg", "mp3", "txt"};
      
      for (int i = 0; i < folders.length; i++) {
         if (p.toString().endsWith("." + folders[i])) {
            Path folderPath = Paths.get(parent + "/" + folders[i]); 
            try {
               Files.move(p, folderPath.resolve(p.getFileName()), StandardCopyOption.REPLACE_EXISTING);
            } catch (IOException e) {
               System.out.println(e);
            }
         }
      }
   }
}