Java program for bubble sort

In this post, you will learn how to write a bubble sort program using the Java programming language.

Bubble sort is a very simple sorting technique in which each element is compared with every other element in the list. This is also called sinking sort. It continuously compares the element with the adjacent item and swaps it if the element is in the wrong order. If the element at the lower index is greater than the element at the higher index, then the two elements are interchanged as the element is placed before the bigger one.

This process will continue working till the largest element moves to the highest index position.

Bubble Sort Example

Suppose we have the following array-

A[] = {10, 43, 23, 56, 16}

These are the bubble sorting techniques.

Pass 1

Compare A[0] and A[1], since A[0] < A[1] then no interchange.

Compare A[1] and A[2], since A[1] > A[2] then interchange.

Compare A[2] and A[3], since A[2] < A[3] then no interchange.

Compare A[3] and A[4], since A[3] > A[4] then interchange.

Pass 2

Compare A[0] and A[1], since A[0] < A[1] then no interchange.

Compare A[1] and A[2], since A[1] < A[2] then no interchange.

Compare A[2] and A[3], since A[2] > A[3] then interchange.

Compare A[3] and A[4], since A[3] < A[4] then no interchange.

Bubble Sorting Algorithm

STEP 1: Repeat Step 2 For 1=0 to N-1
STEP 2: Repeat for J = 0 to N - I
STEP 3: IF A[J] > A[J+1]
		SWAP A[J] and A[J+1]
	[END of INNER LOOP]
[END of OUTER LOOP]
STEP 4: EXIT

Complexity of Bubble sort

Suppose n is the number of element in an array.

f(n) = (n-1)+(n-2)+(n-3)+.....+3+2+1
f(n) = n(n-1)/2
f(n) = n2/2 + O(n) 
     = O(n2)

Bubble sort program in Java using for loop

public class BubbleSortProgram {  
    static void bubbleSort(int[] arr) {  
        int len = arr.length;  
        int temp = 0;  
         for(int i=0; i < len; i++){  
            for(int j=1; j < (len-i); j++){  
                if(arr[j-1] > arr[j]){  
                    
                 //swapping elements  
                 temp = arr[j-1];  
                 arr[j-1] = arr[j];  
                 arr[j] = temp;  
                }  
            }  
         }  
    }  
    
    public static void main(String[] args) {  
        int arr[] ={8,33,41,23,9,6,89,53,16};  
         
        System.out.println("Original array:");  
        for(int i=0; i < arr.length; i++){  
            System.out.print(arr[i] + " ");  
        }  
        System.out.println();  
          
        bubbleSort(arr);
         
        System.out.println("Sorted array:");  
        for(int i=0; i < arr.length; i++){  
            System.out.print(arr[i] + " ");  
        }  
    }  
}

Output of the above code:

Original array:
8 33 41 23 9 6 89 53 16 
Sorted array:
6 8 9 16 23 33 41 53 89

Bubble sort program in Java using while loop

import java.util.Arrays;

public class BubbleSortProgram {

    public static void main(String args[]) {
        String[] bubbleSort = {"chair", "table", "laptop", "bed", "fan"};
        System.out.println("Before Sorting: " + Arrays.toString(bubbleSort));
        bubbleSortFunc(bubbleSort);
        System.out.println("After Sorting: " + Arrays.toString(bubbleSort));
    }

    public static void bubbleSortFunc(String[] str_names) {        
        boolean swapped = true;
        int end = str_names.length - 2;

        while (swapped) {
            swapped = false;
            
            for (int i = 0; i <= end; i++) {
                if(str_names[i].compareTo(str_names[i + 1]) > 0) {
                    swap(str_names, i, i + 1);
                    swapped = true; 
                }
            }
            end--;
        }
    }

    public static void swap(String[] str_names, int from, int to) {
        String temp = str_names[from];
        str_names[from] = str_names[to];
        str_names[to] = temp;
    }
}

Output of the above code:

Before Sorting: [chair, table, laptop, bed, fan]
After Sorting: [bed, chair, fan, laptop, table]

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