The idea of selection sort: iteratively find a smallest (or biggest) element in the remaining part of array and put it to the appropriate position.
The time complexity is pretty bad: O(n2).
This algorithm can only be used for fairly small arrays.
public class ImplementSelectionSort {
private static void selectionSort(int[] array) {
for (int i = 0; i < (array.length - 1); i++) {
var smallestIndex = findSmallest(array, i);
var buf = array[i];
array[i] = array[smallestIndex];
array[smallestIndex] = buf;
}
}
public static int findSmallest(int[] array, int startingIndex) {
var smallest = startingIndex;
for (int i = startingIndex; i < array.length; i++) {
if (array[i] < array[smallest]) {
smallest = i;
}
}
return smallest;
}
public static void main(String[] args) {
var array = new int[]{22, 1, 3, 99, 8};
selectionSort(array);
for (var elem : array) {
System.out.println(elem);
}
}
}