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how to use quick sort algo

harish goyal
Ranch Hand
Posts: 51
how to do quick sort in java.
suppose i have a rray of 10 element;
int a[] ={ 4,5,2,8,4,6,2,4,8,9)
i want to sort them .
in quick sort . we pivot one element and then
find all the nummber below it and about it.
than we sort it seprately.

please help me to understand this concept of quick sort
i want to use quick sort algo in java to sort these elements in java
can anyone help

Steve Morrow
Ranch Hand
Posts: 657

Stan James
(instanceof Sidekick)
Ranch Hand
Posts: 8791
Writing an implementation of Quicksort is going to be a fairly significant job. Using an existing implementation to sort some stuff is very easy. Can you clarify which you have to do? For example, a school assignment might require you to write your own but a job assignment would deliver better results sooner by using what's in the Java libraries.

Ulf Dittmer
Rancher
Posts: 42967
73
Quicksort is generally credited to be the fastest sorting algorithm in most cases, but merge sort isn't bad either. And it's implemented in the Collections.sort methods, so you get it for free
[ August 29, 2005: Message edited by: Ulf Dittmer ]

Layne Lund
Ranch Hand
Posts: 3061
Originally posted by harish goyal:
how to do quick sort in java.
suppose i have a rray of 10 element;
int a[] ={ 4,5,2,8,4,6,2,4,8,9)
i want to sort them .
in quick sort . we pivot one element and then
find all the nummber below it and about it.
than we sort it seprately.

please help me to understand this concept of quick sort
i want to use quick sort algo in java to sort these elements in java
can anyone help

Typically, you should just do

Unless you want to implement quick sort yourself. If so, there are plenty of descriptions about the algorithm online or in any decent text about data structures. Typically, the description will include pseudocode that you can easily translate into Java. If you need help with this translation, let us know.

Layne