Java Source Code sample: Sort Numbers in Bubble Sort

source:linux-mag.com

Below is the java source code on sorting numbers using bubble sort . You can decide on how to sort a number either ascending or descending by just changing the comparison operator in the method BubbleSort.There are many sorting algorithms on sorting numbers but the most used is the selection sort. Actually, bubble sort is not a better choice on sorting numbers but it is pretty good to program while learning different sorting algorithms as well as recursion. It exposed the programmers on different ways on how to solve and program a certain problem and widen his/her knowledge as well as be able to compare its usefulness. After this program I will also upload the selection sort.

Updated:

Below is the quick link for the selection sort.

Java Source Code: How to Sort Numbers using Selection Sort in Recursion

How Bubble Sort Works?

Bubble sort sorts numbers by comparing the number and its following number. For example we will sort the entered 6 numbers in ascending way and here is the user's input.

2 5 3 4 1 6

The first number is 2 and the following number is 5. Is 2 < 5? if yes, proceed. The second comparison will be 5 and 3. Is 5 < 3? since the answer is no, it will sort the numbers in this way.

2 3 5 4 1 6

Then, the next comparison is 5 and 4 and so on until it will be sorted properly from lowest to highest. Here is the complete list on how the numbers above sorted in bubble sort.

2 3 4 5 1 6

2 3 4 1 5 6

2 3 1 4 5 6

2 1 3 4 5 6

1 2 3 4 5 6 - end of sorting and this correct sorted numbers is what the program outputs to the screen

Below is the source code,

Java Source Code: How to sort numbers in Bubble Sort

//java class

public class BubbleSort
{

 public void bubbleSort(int[] arr){
     for(int i=0; i<arr.length; i++){
        for(int j=1; j<arr.length; j++){
            if(arr[j]< arr[j-1] ){
                int temp = arr[j];
                arr[j] = arr[j-1];
                arr[j-1] = temp;            
            }
        }
     }

     for(int i=0; i<arr.length; i++)
     {
         System.out.print(arr[i] + " ");
     }
}

}

//main class

import java.util.Scanner;

public class Main
{

   
    public static void main(String[] args)
    {

        Scanner input = new Scanner(System.in);

        System.out.print("Enter the size of the array: ");
        int n = input.nextInt();
        int[] x = new int[n];

        System.out.print("Enter "+ n +" numbers: ");
        for(int i=0; i<n; i++)
        {
            x[i] = input.nextInt();
        }
        
        BubbleSort access = new  BubbleSort();
	System.out.print("The Sorted numbers: ");
        access.bubbleSort(x);
    }

}

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Sample Output:

Enter the size of the array: 10

Enter 10 numbers: 100 35 45 3 7 2 1 500 200 15

The Sorted Numbers: 1 2 3 7 15 35 45 100 200 500

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