Problem with sorting

Question

Hi all,
I am trying to sort an array using Bubble sort, But it can't seem to work.
can you please look at my code below and tell me where I am going wrong
bubbleSort class
public class bubbleSort {
    int size;
    int[] array;
    public bubbleSort(int size, int[] array) {
        this.size = size;
        this.array = array;
    public void sort(int[] arr, int arraySize) {
        boolean swapped;
        arr = this.array;
        arraySize = this.size;
        int temp;
        do {
            swapped = false;
            for (int i = 0; i < arraySize - 1; i++) {
                if (arr[i] > arr[i + 1]) {
                    temp = arr;
arr[i] = arr[i + 1];
arr[i + 1] = temp;
swapped = true;
} while (swapped != true);
public void swappFunction(int num1, int num2) {
int temp;
temp = num1;
num1 = num2;
num2 = temp;
public void printArray(int[] arr, int arraySize) {
for (int i = 0; i < arraySize; i++) {
System.out.println(arr[i] + " ");
Main class
{code:java}
public class Main {
    public static void main(String[] args) {
        int unsortedArray[] = {12,9,4,99,120,1,3,10};
        bubbleSort bbl_sort = new bubbleSort( unsortedArray.length,unsortedArray);
        System.out.println("Unsorted Array");
        bbl_sort.printArray(unsortedArray, unsortedArray.length);
        bbl_sort.sort(unsortedArray, unsortedArray.length);
        System.out.println("Sorted Array");
        bbl_sort.printArray(unsortedArray, unsortedArray.length);

Answer 1

Try it this way. I commented out the parts that you were trying to make a copy of an array therefore passing by value instead of by reference. You need the side effects reflected on the array otherwise you may need to return an array if you decide to pass by value. I also added a j variable because at the end of each iteration, the last value in the array is sorted, so no need to redo it each time. In addition, you can get the length of the array by using array.length instead of passing the size of the array.
public class bubbleSort {
    int size;
    int[] array;
    public bubbleSort(int size, int[] array) {
        this.size = size;
        this.array = array;
    public void sort(int[] arr, int arraySize) {
        boolean swapped;
        int j = 0;
       // arr = this.array;
        //arraySize = this.size;
        int temp;
        do {
            swapped = false;
            j++;
            for (int i = 0; i < arraySize - j; i++) {
                if (arr[i] > arr[i + 1]) {
                    temp = arr;
arr[i] = arr[i + 1];
arr[i + 1] = temp;
swapped = true;
} while (swapped);
public void swappFunction(int num1, int num2) {
int temp;
temp = num1;
num1 = num2;
num2 = temp;
public void printArray(int[] arr, int arraySize) {
for (int i = 0; i < arraySize; i++) {
System.out.println(arr[i] + " ");
public static void main(String[] args) {
int unsortedArray[] = {12,9,4,99,120,1,3,10};
bubbleSort bbl_sort = new bubbleSort( unsortedArray.length,unsortedArray);
System.out.println("Unsorted Array");
bbl_sort.printArray(unsortedArray, unsortedArray.length);
bbl_sort.sort(unsortedArray, unsortedArray.length);
System.out.println("Sorted Array");
bbl_sort.printArray(unsortedArray, unsortedArray.length);