What is the method for quick sorting arrays in Java?

The quicksort method for Java arrays is implemented using recursion. Here are the specific steps:

1. Choose a pivot element, which can be any element in the array.
2. Split the array into two subarrays, one containing elements less than or equal to the pivot element, and the other containing elements greater than the pivot element. This process is called partitioning.
3. Recursively quick sort the two subarrays after partitioning.
4. Merge the sorted subarrays.

There are various methods to achieve the partition process in quicksort, some common methods include:

1. Hoare partitioning: select the first element of the array as the pivot element, then scan from both ends of the array, swapping two elements until the pointers meet, and finally swap the pivot element with the position where the pointers meet.
2. Lomuto partition: Choose the last element of the array as the pivot element, then scan from the beginning of the array, placing all elements less than or equal to the pivot to the left side of the array, and finally placing the pivot element in its correct position.

Regardless of the chosen partition method, the time complexity of quicksort is O(nlogn) and the space complexity is O(logn). Quicksort is an in-place sorting algorithm that does not require additional space.