复习下冒泡排序，呵呵

public class BubbleSort : SortBase
    {
        public BubbleSort(int num, int[] arr):
            base(num,arr)
        { 
        }

        public override int[] Sort()
        {
            int tmp;
            for (int i = _arr.Length-1; i >= 0; i--)
            {
                for (int j = 0; j < i; j++)
                {
                    if (_arr[j + 1] < _arr[j])
                    {
                        tmp = _arr[j];
                        _arr[j] = _arr[j + 1];
                        _arr[j + 1] = tmp;
                    }
                }
            }
            return _arr;
        }
    }

    public abstract class SortBase
    {
        protected int _num;

        protected int[] _arr;

        public abstract int[] Sort();

        public SortBase(int num, int[] arr)
        {
            _num = num;
            _arr = arr;
        }

        public virtual string GetResult()
        {
            int[] _result=Sort();
            string ss = "结果为：";
            for (int i = 0; i < _result.Length; i++)
            {
                ss += _result[i].ToString() + " ";
            }
            return ss;
        }
    }