54 lines
1.4 KiB
Java
54 lines
1.4 KiB
Java
package Sorts;
|
|
|
|
import java.util.Random;
|
|
|
|
/** BubbleSort algorithm implements using recursion */
|
|
public class BubbleSortRecursion implements SortAlgorithm {
|
|
public static void main(String[] args) {
|
|
Integer[] array = new Integer[10];
|
|
|
|
Random random = new Random();
|
|
/* generate 10 random numbers from -50 to 49 */
|
|
for (int i = 0; i < array.length; ++i) {
|
|
array[i] = random.nextInt(100) - 50;
|
|
}
|
|
|
|
BubbleSortRecursion bubbleSortRecursion = new BubbleSortRecursion();
|
|
bubbleSortRecursion.sort(array);
|
|
|
|
/* check array is sorted or not */
|
|
for (int i = 0; i < array.length - 1; ++i) {
|
|
assert (array[i].compareTo(array[i + 1]) <= 0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param unsorted - an array should be sorted
|
|
* @return sorted array
|
|
*/
|
|
@Override
|
|
public <T extends Comparable<T>> T[] sort(T[] unsorted) {
|
|
bubbleSort(unsorted, unsorted.length);
|
|
return unsorted;
|
|
}
|
|
|
|
/**
|
|
* BubbleSort algorithm implements using recursion
|
|
*
|
|
* @param unsorted array contains elements
|
|
* @param len length of given array
|
|
*/
|
|
private static <T extends Comparable<T>> void bubbleSort(T[] unsorted, int len) {
|
|
boolean swapped = false; /* flag to check if array is sorted or not */
|
|
for (int i = 0; i < len - 1; ++i) {
|
|
if (SortUtils.greater(unsorted[i], unsorted[i + 1])) {
|
|
SortUtils.swap(unsorted, i, i + 1);
|
|
swapped = true;
|
|
}
|
|
}
|
|
if (swapped) {
|
|
bubbleSort(unsorted, len - 1);
|
|
}
|
|
}
|
|
}
|