stream操作两个List

取出两个List中相同的元素：

如果不使用流写法，需要两个List嵌套循环对比

使用流：

private static final List list = Lists.newArrayList("1","2","3","4","5");

private static final List list2 = Lists.newArrayList("0","1","2","3","4");

public void stream(){

//List创建流  过滤 - > List2中包含List中的元素  形成一个新的List返回

List l = (List)list.stream().filter(it->list2.contains(it)).collect(Collectors.toList());

}