选择排序

       for (int i = 0; i < arr.length - 1; i++) {
            int minindex = i;
            for (int j = arr.length - 1; j > i; j--) {
                if (arr[j] < arr[minindex]) {
                    minindex = j;
                }
            }
            int temp = 0;
            if(i != minindex)
            {
                temp = arr[i];
                arr[i] = arr[minindex];
                arr[minindex] = temp;
            }
        }
        
        
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + "  ");
        }