Bubble Sort

public static int[] bubbleSort(int[] arr) {
int len = arr.length;

for (int i = len - 1; i >= 0; i--) {
for (int j = 0; j < i; j++) {
if (arr[j] > arr[j + 1]) {
int temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
return arr;
}