Bubble Sort also called Sinking Sort is a comparison sort algorithm where smaller or larger “bubble” elements move to top.

Complexity

Complexity of bubble sort is O(n2) in both average and worst case while O(n) in best case when elements are already sorted. Where n is number of elements.

Drawback

It will not be efficient in the case of a reverse-ordered collection or number of elements are high.

import java.util.Scanner;

public class BubbleSort {
public static void main(String []args) {
int n, c, d, swap;
//For User Input
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++) {
/* In case of descending order use < */ if (array[d] > array[d+1])
{
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]);
}
}

More

For more Algorithms and Java Programing Test questions and sample code follow below links

• Frequently Asked Algorithms and Programs in Interviews
• Java Sample Code
• JDBC Sample Code