JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Implement bubble sort in java.


Bubble sort, also referred to as sinking sort, is a simple sorting algorithm that works by repeatedly stepping through the list to be sorted, comparing each pair of adjacent items and swapping them if they are in the wrong order. The pass through the list is repeated until no swaps are needed, which indicates that the list is sorted. The algorithm gets its name from the way smaller elements "bubble" to the top of the list. Because it only uses comparisons to operate on elements, it is a comparison sort. Although the algorithm is simple, most of the other sorting algorithms are more efficient for large lists.

Bubble Sort

Bubble sort has worst-case and average complexity both О(n2), where n is the number of items being sorted. There exist many sorting algorithms with substantially better worst-case or average complexity of O(n log n). Even other О(n2) sorting algorithms, such as insertion sort, tend to have better performance than bubble sort. Therefore, bubble sort is not a practical sorting algorithm when n is large.Performance of bubble sort over an already-sorted list (best-case) is O(n).


package com.java2novice.algos;
 
public class MyBubbleSort {
 
    // logic to sort the elements
    public static void bubble_srt(int array[]) {
        int n = array.length;
        int k;
        for (int m = n; m >= 0; m--) {
            for (int i = 0; i < n - 1; i++) {
                k = i + 1;
                if (array[i] > array[k]) {
                    swapNumbers(i, k, array);
                }
            }
            printNumbers(array);
        }
    }
 
    private static void swapNumbers(int i, int j, int[] array) {
 
        int temp;
        temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
 
    private static void printNumbers(int[] input) {
         
        for (int i = 0; i < input.length; i++) {
            System.out.print(input[i] + ", ");
        }
        System.out.println("\n");
    }
 
    public static void main(String[] args) {
        int[] input = { 4, 2, 9, 6, 23, 12, 34, 0, 1 };
        bubble_srt(input);
 
    }
}

Output:
2, 4, 6, 9, 12, 23, 0, 1, 34, 

2, 4, 6, 9, 12, 0, 1, 23, 34, 

2, 4, 6, 9, 0, 1, 12, 23, 34, 

2, 4, 6, 0, 1, 9, 12, 23, 34, 

2, 4, 0, 1, 6, 9, 12, 23, 34, 

2, 0, 1, 4, 6, 9, 12, 23, 34, 

0, 1, 2, 4, 6, 9, 12, 23, 34, 

0, 1, 2, 4, 6, 9, 12, 23, 34, 

0, 1, 2, 4, 6, 9, 12, 23, 34, 

0, 1, 2, 4, 6, 9, 12, 23, 34, 
 Next Program >>

Java Sorting Algorithms Examples

  1. Implement bubble sort in java.
  2. Implement selection sort in java.
  3. Implement insertion sort in java.
  4. Implement quick sort in java.
  5. Implement merge sort in java.
Knowledge Centre
What is java static import?
By using static imports, we can import the static members from a class rather than the classes from a given package. For example, Thread class has static sleep method, below example gives an idea:

import static java.lang.Thread;
public class MyStaticImportTest {
public static void main(String[] a) {
try{
sleep(100);
} catch(Exception ex){

}
}
}
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If you don’t make mistakes, you’re not working on hard enough problems. And that’s a big mistake.
-- Frank Wilczek

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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