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This article is to share with you about how to analyze the LinkedHashSet source code, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

We will learn about LinkedHashSet collections. We can basically guess from the name of the LinkedHashSet collection that the bottom layer of the LinkedHashSet collection should be implemented with the LinkedHashMap collection. This is because only the underlying implementation of LinkedHashMap can ensure that the order in which LinkedHashSet collections add elements is consistent with the order in which they are accessed, which is a unique feature of LinkedHashSet collections compared to HashSet collections. To prove what we said above, let's take a brief look at the source code of the LinkedHashSet collection, because most of the logic involved in the source code has already been introduced in the LinkedHashMap collection, so here we just look at it briefly and don't explain it too much. Again, like other collections, let's first look at the initialization of the LinkedHashSet collection.

Initialization

Let's take a look at the underlying implementation of the add method in LinkedHashSet.

We see that the above code logic directly calls the put method of map, which is the same as the bottom layer of HashSet.

The LinkedHashSet collection ensures that the order in which elements are added is the same as the order in which they are accessed

The LinkedHashSet collection cannot save the same elements

The LinkedHashSet collection is not a thread-safe collection class

The above is how to parse the LinkedHashSet source code, and the editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.

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