Java Program to Sort the Elements of an Array in Ascending Order
Problem statement: Sort the given array in ascending order such that elements will be arranged from smallest to largest. Consider an illustration below:
Let the original array be as follows:
| -5 | -9 | 8 | 12 | 1 | 3 |
Array generated after sorting the above array is as follows:
| -9 | -5 | 1 | 3 | 8 | 12 |
- Elements are sorted in such a way that the smallest element will appear on the extreme left which in this case is -9. The largest element will appear on the extreme right which in this case is 12.
Approaches:
- Using bubble sort(naive)
- Using sort() method of arrays class(optimal)
Approach 1: Using Bubble sort
Algorithm:
- Compare adjacent elements with each other.
- Use nested for loop to keep track.
- Swap the elements if the first element is greater than the second element.
Example
Java
// Java Program to Sort Elements of an Array// in Ascending Order// Main classclass GFG { // Declaration global variable length static int length; // Method 1 // To print the array public static void printArray(int[] array) { // Iterating using for loops for (int i = 0; i < length; i++) { System.out.print(array[i] + " "); } System.out.println(); } // Method 2 // To sort an array public static void sortArray(int[] array) { int temporary = 0; // Sort the array 'arr' elements in ascending order // using nested for loops for (int i = 0; i < length; i++) { for (int j = i + 1; j < length; j++) { if (array[i] > array[j]) { temporary = array[i]; array[i] = array[j]; array[j] = temporary; } } } // Displaying elements of array after sorting System.out.println( "Elements of array sorted in ascending order: "); printArray(array); } // Method 3 // Main driver method public static void main(String[] args) { // Initializing custom array elements // The array contains 6 elements. int[] array = new int[] { -5, -9, 8, 12, 1, 3 }; // Initialize length length = array.length; // Displaying elements of original array System.out.print("Elements of original array: "); // Call printArray method printArray(array); // Call sortArray method sortArray(array); }} |
Output
Elements of original array: -5 -9 8 12 1 3 Elements of array sorted in ascending order: -9 -5 1 3 8 12
Time Complexity: O(n^2), where n is the length of an array.
Approach 2: Using sort() method of Arrays class
The sort() method is a java.util.Arrays class method used to sort array elements. It by default sorts of array elements in ascending order.
Syntax:
Arrays.sort(arrayName);
Parameters: Array to be sorted
Return Type: NA
Example
Java
// Java Program to sort the elements of an array// in Ascending Order by Inbuilt Methods// Importing Arrays class from java.util packageimport java.util.Arrays;// Main classpublic class GFG { // Main driver method public static void main(String[] args) { // Initialize array // The array contains 6 elements. int[] array = new int[] { -5, -9, 8, 12, 1, 3 }; // Displaying elements of original array System.out.print("Elements of original array: "); for (int i = 0; i < array.length; i++) { System.out.print(array[i] + " "); } // Using Arrays.sort() method to sort array // elements in ascending order. Arrays.sort(array); System.out.println(); // Displaying elements of array after sorting System.out.println( "Elements of array sorted in ascending order : " + Arrays.toString(array)); }} |
Output
Elements of original array: -5 -9 8 12 1 3 Elements of array sorted in ascending order : [-9, -5, 1, 3, 8, 12]
Time Complexity: O(n log(n)), where n is the size of an array.
