1. First go to the official website and now the JAVA installation package
download address of the JAVA installation package: https://www.oracle.com/technetwork/java/javase/downloads/index.html (official website address), after opening the link, as shown below:
Here, Java18 and Java19 are too advanced.
We download java1.8 here, also known as Java8.0, we click on the place in the picture below.
Here are all the JavaSEs of Java from its birth to the present,
We choose JavaSE8, later and earlier, I choose later because I am an advanced new youth.
Then we just choose a jdk version
Regardless of SE, the abbreviation of each letter starts with JDK. Just download it.
If you think the official website is troublesome, I also have a link to Baidu Netdisk here.
Link: https://pan.baidu.com/s/1XUEz6ibug5JeQMZ_X9IXJQ
Extraction code: 1314
There are four of them, let you choose. Just use Baidu Netdisk, everyone knows it, it’s a bit slow.
After downloading, we will officially start our installation journey.
Then we started double-clicking on Ang.
If you want to change the installation path here, you can change it. It is best not to have Chinese in the path. Did you hear me, what about you?
Then wait quietly.
It's the same here, everyone can change it if they want. Did you see it, this is JRE.
Then it will be fine, hehehe.
Next we configure the environment, hehehe.
We press the system win key on the keyboard 
is this key on the keyboard. Then enter to edit the system environment variables.
Click to open.
Then click Environment Variables.
We create a new JAVA_HOME in the system variable, that is, click the new (W) above
The first input JAVA_HOME
The second input is the location where you just installed the jdk
After filling it out, click OK.
Then we click on the path path inside.
Create a new %JAVA_HOME%\bin .
Like this, and click OK. save. Click OK all the way.
Then we can start to test whether it is installed correctly.
Press the win and r keys on your computer at the same time.
This will come out, then type cmd.
A black window will come out, and then enter java and javac commands.
Like this, it means that your configuration is successful. Congratulations, you have taken a small step, but China's technology may take a big step because of your small step.
Then we download IDEA.
Also two options:
One official website:
Download IntelliJ IDEA: The Capable & Ergonomic Java IDE by JetBrains
If this is the case, just choose the community version. It’s free and doesn’t cost money. It’s community.
Two Baidu network disk:
Link: https://pan.baidu.com/s/1Sf_91hNlugmpfnoNsuYDUg
Extraction code: 1314
Everyone takes what they want, and the subsequent installation steps are not bad, all the way to the end.
It is recommended that you use the one in my online disk, which contains detailed steps and surprises.