API offline Document download method for Oracle website JDK

Recently Learning Java development, the most frequently used tool is Java API, when we have no connected network, and the need for API documentation, it is obvious that we need to store an offline document on our computer.
Here are the steps to download API documentation to Oracle official website:

0. Enter http://www.oracle.com/index.html into Oracle's website in the address bar, such as:

1. Move your mouse over to downloads, and don't point it! You will see a series of Oracle product downloads, and notice that the first column has a caption called "Java for Developers" under the red headline titled "Popular Downloads", and when you click inside, you see the following:

2. Here are the latest Java SE Downloads, including JDK,JRE, which you can click to download yourself. We go back to the page and notice that there are 6 subheadings on the Java SE Downloads header, namely overview, Downloads, documentation, Community, technologies, and training. The following pages:

3. We're going to pay attention here.

(1) If you click on the documentation, and then enter the following several images, then you enter the online API documentation.

(2) If you click on technologies, it is the page we want to download offline.

Always feel that it is difficult to find this thing, so I use a picture tagging method to replace with the text description, I think this effect will be better.