CODE EXAMPLE FOR JAVA

quick sort function java

  static void swap(int[] arr, int i, int j) {
    int temp = arr[i];
    arr[i] = arr[j];
    arr[j] = temp;
  }  
  
  static int partition(int[] arr, int low, int high) { 
    
    int pivot = arr[high]; 
    // Index of smaller element and
    // indicates the right position
    // of pivot found so far
    int i = (low - 1); 
  
    for(int j = low; j <= high - 1; j++) {
      // If current element is smaller 
      // than the pivot
      if (arr[j] < pivot) {
        // Increment index of 
        // smaller element
        i++; 
        swap(arr, i, j);
      }
    }
    swap(arr, i + 1, high);
    return (i + 1);
  }
  
  static void quickSort(int[] arr, int low, int high) {
      if (low < high) {
          // pi is partitioning index, arr[p]
          // is now at right place 
          int pi = partition(arr, low, high);

          // Separately sort elements before
          // partition and after partition
          quickSort(arr, low, pi - 1);
          quickSort(arr, pi + 1, high);
      }
  }