[集合和迭代器](%E9%9B%86%E5%90%88/%E9%9B%86%E5%90%88%E5%92%8C%E8%BF%AD%E4%BB%A3%E5%99%A8.md) [ArrayList集合](ArrayList%E9%9B%86%E5%90%88.md) [List](%E9%9B%86%E5%90%88/List.md) [Set](%E9%9B%86%E5%90%88/Set.md) [判断集合唯一](%E9%9B%86%E5%90%88/%E5%88%A4%E6%96%AD%E9%9B%86%E5%90%88%E5%94%AF%E4%B8%80.md) [Map和Entry](%E9%9B%86%E5%90%88/Map%E5%92%8CEntry.md) [stack类](%E9%9B%86%E5%90%88/stack%E7%B1%BB.md) [Collections集合工具类](%E9%9B%86%E5%90%88/Collections%E9%9B%86%E5%90%88%E5%B7%A5%E5%85%B7%E7%B1%BB.md) [Stream数据流](%E9%9B%86%E5%90%88/Stream%E6%95%B0%E6%8D%AE%E6%B5%81.md) [foreach不能修改内部元素](../foreach%E4%B8%8D%E8%83%BD%E4%BF%AE%E6%94%B9%E5%86%85%E9%83%A8%E5%85%83%E7%B4%A0.md) [of方法](../of%E6%96%B9%E6%B3%95.md)