subcategory, Queue, and a side category, Iterator.
a collection is an object，but an array is not an object in Java...stringList = List.of("one", "two", "three");
Set stringSet = Set.of("one", "two", "three");
Java...Starting with Java SE 8, you should favor the sort() method from the Listinterface.
shuffle() randomly...Java SE 9
Map map =
Map.of(
1, "one",
2, "two",
3, "three...参考资料：
The Collections Framework https://dev.java/learn/api/collections-framework/
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