java 中的List排序

List<StockModel> result = CollectionBuilder.newArrayList();  //要排序的List
MineComparator com = new MineComparator(); //自定義的比較類
Collections.sort(result, com); //把result排序了。

private class MineComparator implements Comparator{

        @Override
        public int compare(Object lhs, Object rhs) {

            StockModel one = (StockModel)lhs;
            StockModel two = (StockModel)rhs;
            if(up_down_user ==1){//xiao__da
                if(change_flag == 0){
                    double r1 = Double.parseDouble(one.getZhangfu());
                    double r2 = Double.parseDouble(two.getZhangfu());
                    return r1 < r2 ? -1 : 1;
                }
            }
        }
    }

自定義的Comparator 類，可以選擇自己比較的數據。並且返回一個正值或者負值，相等返回0