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Today, I will talk to you about how to carry out Stack source code analysis, many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

We introduce another kind of collection that is also implemented in a data manner at the bottom, which is the Stack collection. Compared with ArrayList and Vector, Stack has some unique features. It is precisely because Stack has its own unique characteristics that Stack is somewhat different from ArrayList and Vector in use, so let's first look at the basic use of the Stack collection, and then analyze the underlying source code of the Stack collection.

Stack is the stack, and its feature compared with other collections is that last-in, first-out, that is, elements that are later added to the Stack collection are added to the top of the stack. Let's take a look at what methods are included in the Stack collection.

Let's demonstrate the basic use of the above method through a simple example.

Let's take a look at the underlying source code of the Stack collection, or just like the ArrayList collection and the Vector collection, let's first look at the initialization of the Stack collection.

There is only a no-argument constructor in the source code, which means that the initialization of the underlying array is not performed when we create the Stack object.

The above code is a way for the Stack collection to add elements to the top of the stack. Let's see if the above code feels familiar, just like the underlying source code of the Vector collection. This is because the Stack collection is a subclass of the Vector collection, that is, the Stack collection inherits the Vector collection by default. Here is the underlying source code.

So we can understand that the underlying implementation principle of the Stack set is the same as the Vector set, including the automatic extension of the underlying array and other features are the same. In other words, the Stack collection is the same as the Vector collection. When the underlying data exceeds the maximum capacity, it automatically expands to twice the original capacity to store elements.

Let's take a look at the underlying implementation of other methods in the Stack collection, because the method logic has been introduced in the Vector collection, and the implementation logic of the method is relatively simple, so we won't analyze it in detail here, just show it briefly.

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