public static void main(String[] args) {

int[] array = {12, -5, 0, 23, -17, 8, -1, 34, -9, 2, 19, -12, 7, -3, 25, -20, 4, -7, 15, -2};

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

}

static void swap(int[] arr , int first , int second){

int temp = arr[first];

arr[first] = arr[second];

arr[second] = temp;

}

static int getMinIndex(int[] arr , int start , int last){

int min = start;

for (int i = start; i <= last ; i++) {

if(arr[i]<arr[min])

min = i;

}

return min;

}

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

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

int start = i ;

int end = arr.length-1;

int minIndex = getMinIndex(arr , start , end );

swap(arr , minIndex , start);

}

return arr;

}