Java program to bubble sort

Java program to bubble sort: This code sorts numbers inputted by user using Bubble sort algorithm.

Java programming code

import java.util.Scanner;
 
class BubbleSort {
  public static void main(String []args) {
    int n, c, d, swap;
    Scanner in = new Scanner(System.in);
 
    System.out.println("Input number of integers to sort");
    n = in.nextInt();
 
    int array[] = new int[n];
 
    System.out.println("Enter " + n + " integers");
 
    for (c = 0; c < n; c++) 
      array[c] = in.nextInt();
 
    for (c = 0; c < ( n - 1 ); c++) {
      for (d = 0; d < n - c - 1; d++) {
        if (array[d] > array[d+1]) /* For descending order use < */
        {
          swap       = array[d];
          array[d]   = array[d+1];
          array[d+1] = swap;
        }
      }
    }
 
    System.out.println("Sorted list of numbers");
 
    for (c = 0; c < n; c++) 
      System.out.println(array[c]);
  }
}

Complexity of bubble sort is O(n²) which makes it a less frequent option for arranging in sorted order when quantity of numbers is high.

Download Bubble sort Java program.

Output of program:

You can also use sort method of Arrays class to sort integers in ascending order but remember that sort method uses a variation of Quick sort algorithm.

import java.util.Arrays;
 
class Sort
{
  public static void main(String args[])
  {
    int data[] = { 4, -5, 2, 6, 1 };
 
    Arrays.sort(data);
 
    for (int c: data) 
    {
      System.out.println(c);
    }
  }
}