What should you pay attention to when using java's Sorted?

Concept

1. Sorted is an intermediate operation that returns a Stream in sorted order. If you do not enter a custom Comparator, the features will be arranged in natural order.

Usage Notes

2. After performing the Sorted operation, the order of the elements in stringCollection has not changed. Sorted only sorts the elements in the stream without changing the order of the elements in the original collection.

Examples

stringCollection
    .stream()
    .sorted()
    .filter((s) -> s.startsWith("a"))
    .forEach(System.out::println);
// "aaa1", "aaa2"

What collection classes are there in Java

Collections in Java are mainly divided into four categories:

1, List List: ordered, repeatable;

2, Queue queue: ordered, repeatable;

3, Set collection: non-repeatable;

4, Map mapping: unordered, unique keys, non-unique values.

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