2. 选择排序

代码实现:

public class SelectSort {
    public static void main(String[] args) {
        SelectSort sort = new SelectSort();
        int[] array = {8,4,6,1};
        System.out.println(Arrays.toString(sort.selectSort(array)));
    }
    public int[] selectSort(int[] arr){
        for (int i = 0; i < arr.length; i++) {
            //先假设最小值为arr[0], 最小值的下标为0
            int min = arr[i];
            int minIndex = i;
            for (int j = i + 1; j < arr.length; j++) {
                //当前假定的最小值并不是最小的
                if (min > arr[j]){
                    min = arr[j];
                    minIndex = j;
                }
            }
            if (minIndex != i){
                arr[minIndex] = arr[i];
                arr[i] = min;
            }
        }
        return arr;
    }
}