Java Program - Bubble Sort

This article is created to cover a program in Java that performs the sorting of an array using bubble sort technique. That is, this article includes multiple bubble sort programs in Java. List of bubble sort programs included in this article:

Bubble sort program in Java - basic version
Bubble sort program in Java - complete version
Bubble sort program in Java - descending order
Bubble sort with printing of new array after each sort

If you're not aware about, How bubble sort works ?
Refer to Bubble Sort Logic. Now let's move on, and create a bubble sort program in Java.

Bubble Sort in Java - Basic Version

The question is, write a Java program to perform bubble sort based on 10 elements. The 10 elements must be received by user at run-time of the program. The program given below is its answer. This program sorts in ascending order.

import java.util.Scanner;

public class fresherearth
{
   public static void main(String[] args)
   {
      int n=10, i, j, x;
      int[] array = new int[n];
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter 10 Elements in Random Order: ");
      for(i=0; i<n; i++)
      {
         array[i] = s.nextInt();
      }
      
      for(i=0; i<(n-1); i++)
      {
         for(j=0; j<(n-i-1); j++)
         {
            if(array[j]>array[j+1])
            {
               x = array[j];
               array[j] = array[j+1];
               array[j+1] = x;
            }
         }
      }
      
      System.out.println("\nThe new sorted array is:");
      for(i=0; i<n; i++)
         System.out.print(array[i]+ " ");
   }
}

The snapshot given below shows the sample run of above bubble sort program in Java, with user input 10, 19, 11, 18, 12, 17, 13, 16, 14, 15 as ten elements in random order. Random order means, all the elements are neither in ascending nor in descending order:

Bubble Sort in Java - Complete Version

Since previous program operates based on 10 elements or numbers only. Therefore I've modified that program to allow user to define the size of array too, along with its elements.

import java.util.Scanner;

public class fresherearth
{
   public static void main(String[] args)
   {
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the Size: ");
      int n = s.nextInt();
      
      int[] arr = new int[n];
      
      System.out.print("Enter " +n+" Elements in Random Order: ");
      for(int i=0; i<n; i++)
         arr[i] = s.nextInt();
      
      System.out.println("\n\nSorting the array...");
      for(int i=0; i<(n-1); i++)
      {
         for(int j=0; j<(n-i-1); j++)
         {
            if(arr[j]>arr[j+1])
            {
               int temp = arr[j];
               arr[j] = arr[j+1];
               arr[j+1] = temp;
            }
         }
      }
      System.out.println("The array is sorted successfully!");
      
      System.out.println("\nThe new sorted array is:");
      for(int i=0; i<n; i++)
         System.out.print(arr[i]+ " ");
   }
}

The sample run with user input 5 as size, 1, 5, 2, 4, 3 as five elements, is shown in the snapshot given below:

Bubble Sort in Java - Descending Order

To sort an array in descending order, using bubble sort technique, only replace that greater than (>) sign to less than (<), that is available inside condition of if statement, in the sorting loop. That is, replace:

if(arr[j]>arr[j+1])

from above program, with:

if(arr[j]<arr[j+1])

Only the matter of a sign, a single character. The whole program gets changed. Here is the snapshot of sample run with same user input as of previous program's sample run:

Bubble Sort in Java - Print Array after Each Sort

This is the last program of this article, created to print new array after each sort using bubble sort technique. This program provides the rough look, how the bubble sort actually performs.

import java.util.Scanner;

public class fresherearth
{
   public static void main(String[] args)
   {
      Scanner s = new Scanner(System.in);
      
      System.out.print("Enter the Size: ");
      int n = s.nextInt();
      
      int[] arr = new int[n];
      
      System.out.print("Enter " +n+" Elements in Random Order: ");
      for(int i=0; i<n; i++)
         arr[i] = s.nextInt();
      
      System.out.println("\nSorting the array...");
      for(int i=0; i<(n-1); i++)
      {
         for(int j=0; j<(n-i-1); j++)
         {
            if(arr[j]>arr[j+1])
            {
               int temp = arr[j];
               arr[j] = arr[j+1];
               arr[j+1] = temp;
            }
         }
         System.out.print("\nStep No." +(i+1)+ " ->  ");
         for(int j=0; j<n; j++)
            System.out.print(arr[j]+ " ");
      }
      System.out.println("\n\nThe array is sorted successfully!");
      
      System.out.println("\nThe new sorted array is:");
      for(int i=0; i<n; i++)
         System.out.print(arr[i]+ " ");
   }
}

Here is its sample run with user input 10 as size, 1, 10, 2, 9, 3, 8, 4, 7, 6, 5 as ten elements:

Below is another sample run with same user input as size, and 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 as ten elements:

Same Program in Other Languages

Java Online Test

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