Quick Sort Example Program in Java

package in.malliktalksjava;

* @author malliktalksjava
* Sort the given array using QuickSort Algorithm
public class QuickSortExample {

private int array[];
private int length;

* @param args
* Main Method. Calls the sort method and print the output into
* console.
public static void main(String args[]) {
QuickSortExample quickSorter = new QuickSortExample();
int[] input = { 15, 42, 14, 100, 85, 1, 13, 6, 9 };
for (int count : input) {
System.out.print(” “);

* @param inputArr
* Checks given array is empty or null, if not calls quickSort
* method.
public void sortArray(int[] inputArr) {

if (inputArr == null || inputArr.length == 0) {
this.array = inputArr;
length = inputArr.length;
quickSort(0, length – 1);

* @param lowerIndex
* @param higherIndex
* Sorts the given array
private void quickSort(int lowerIndex, int higherIndex) {

int temp1 = lowerIndex;
int temp2 = higherIndex;
// calculate pivot number, here pivot is middle index number
int pivot = array[lowerIndex + (higherIndex – lowerIndex) / 2];
// Divide into two arrays
while (temp1 <= temp2) {
* In each iteration, we will identify a number from left side which
* is greater then the pivot value, and also we will identify a
* number from right side which is less then the pivot value. Once
* the search is done, then we exchange both numbers.
while (array[temp1] < pivot) {
while (array[temp2] > pivot) {
if (temp1 <= temp2) {
exchangeNumbers(temp1, temp2);
// move index to next position on both sides
// call quickSort() method recursively
if (lowerIndex < temp2)
quickSort(lowerIndex, temp2);
if (temp1 < higherIndex)
quickSort(temp1, higherIndex);

* @param param1
* @param param2
* Exchange the numbers and set to instance array variable
private void exchangeNumbers(int param1, int param2) {
int temp = array[param1];
array[param1] = array[param2];
array[param2] = temp;


Other Useful Links:

Bubble Sort Example in JAVA

Selection Sort Example Program in JAVA

Insertion Sort Example program in JAVA

Merge Sort Example in Java


I born in Good cultural place called India. My family is traditional family. We fallow all Indian traditions.

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Posted in JAVA
5 comments on “Quick Sort Example Program in Java
  1. […] Quick Sort Example Program in Java […]

  2. […] Quick Sort Example Program in Java […]

  3. B. M. says:

    I need to bookmark as I need a lot of java tutorials .. 🙂

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April 2014
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Mallikarjun Gunda

This is Mallikarjun Gunda, I am working as a software professional. Blogging is my Passion. This blog contains the posts on Java related technologies and programming languages. I am happy to share my knowledge through the blogs.

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