How to Sort an Array in Java with Examples

#java #sort

https://grokonez.com/java/how-to-sort-an-array-in-java-tutorial-with-example

In the tutorial, we will discuss how to Sort an Array with Java in ascending and descending order. java.util.Arrays class provides a lot of Methods to sort an Array with difference types:

With Primitives Array, We use the method such as: static void sort(int[] a).
With String or Objects Array that implement Comparable, We use method: static void sort(Object[] a).
With Custom Object Array that no implement Comparable, We use method: sort(T[] a, Comparator super T> c).

Let's do more details with Java Array Sorting.

Sort with Primitives Java Array

We define a simple Int Java Array:


int[] numbers = new int[] { -9, 5, 4, 8, 11, -2, 2 };

Sorting in Ascending Order

We use the method static void sort(int[] a) to sort the specified array into ascending numerical order.

The method returns nothing
The Sorting algorithm is a Dual-Pivot Quicksort
This algorithm offers O(n log(n)) performance so it is typically faster than traditional (one-pivot) Quicksort implementations.

Practice:

package com.grokonez.sortarray;

import java.util.Arrays;

public class JavaArraySortingExample {
    public static void main(String[] args) {
        int[] numbers = new int[] { -9, 5, 4, 8, 11, -2, 2 };
        
        // Sorting
        Arrays.sort(numbers);
        
        // Print Sorted-Array after Sorting
        for(int i=0; i<numbers.length; i++) {
            System.out.println(numbers[i]); 
        }
    }
}

Output: