How to implement QuickSort in Java

import java.util.*;
class Quick_Sort {
    
  public static int[] QuickSort(int[] arr, int elements) {
      if(elements < 2){     //Base Case
          return arr;
      }
      int current_position=0;   //position of pivot element
      int temp; //a temporary variable to assist in swapping
      for(int i=1; i<elements; i++) //Partitioning loop
      {
          if(arr[i] <= arr[0])
          {
              current_position++;
              temp = arr[i];
              arr[i] = arr[current_position];
              arr[current_position] = temp;
          }
      }
      temp = arr[0]; 
      arr[0] = arr[current_position]; 
      arr[current_position] = temp; //Brings pivot to it's appropriate position
      
      int[] left = QuickSort(arr,current_position); //sorts the elements to the left of pivot
      
      int[] arr2 = Arrays.copyOfRange(arr, current_position+1, elements);//separates elements right of pivot
      
      int[] right = QuickSort(arr2, elements-current_position-1); //sorts the elements to the right of pivot
      
      int[] final_array = new int[elements]; //final array, to merge everything together
      
      for(int i=0; i<current_position; i++)
      {
          final_array[i] = left[i]; 
      }
      final_array[current_position] = arr[current_position];
      for(int i=current_position+1; i<elements; i++)
      {
          final_array[i] = right[i-current_position-1];
      }
    return final_array;
  }
    public static void main( String args[] ) {
        int[] array = {4,2,7,3,1,6}; //array to be sorted
        System.out.print("Original Array: [");
        for(int i=0; i<array.length;i++)
        {   
            System.out.print(array[i]);
            System.out.print(" ");
        }
        System.out.println("]");
        array = QuickSort(array, array.length);//sorting 
        
        System.out.print("Sorted Array: ["); //printing the sorted array
        for(int i=0; i<array.length;i++)
        {   
            System.out.print(array[i]);
            System.out.print(" ");
        }
        
        System.out.print("]");
    }
}