public static void main(String[] args) {

int[] array = {17, -4, 23, 0, -15, 8, 3, -9, 12, -1, 6, -20, 14, 5, -7, 19, -2, 11, -13, 2};

System.out.println(Arrays.toString(bubble(array)));

}

static void swap(int[] arr, int i, int j) {

int temp = arr[i];

arr[i] = arr[j];

arr[j] = temp;

}

static int[] bubble(int [] arr){

for (int i = 0; i < arr.length-1; i++) {

for(int j = 0 ; j < arr.length-i-1 ; j++){

if(arr[j]>arr[j+1])

swap(arr, j , j+1);

}

}

return arr;

}