java遍历List

 初始数据，例如DAO层返回的商品列表List，如下：

List<Goods> list = goodMapper.getGoodsBySid(sid);

1、迭代器遍历，方便删除元素

Iterator<Goods> iterator = list.iterator(); while (iterator.hasNext()) { Goods good = iterator.next(); if(good.getGid==20){ iterator.remove(); } }

2、增强for循环

for (Goods good : list) { if (good.getGid==20) { list.remove(good); break; } }

3、普通for循环

for (int i = 0; i < list.size(); i++) { Goods good = list.get(i); if (good.getGid==20) { list.remove(i); break; } }

4、Lambda表达式

list.forEach(one->{ if (one.getGid()==20) { list.remove(one); return; } });