Download: HTTPS: //www.oracle.com/technetwork/java/javase/downloads/index-jsp-138363.html

2. Install the JDK:

It can be set to the path you want to install.

3. Environment variable configuration

3.1 Environment Variables window opens

Right  This PC (this computer) -> Properties (Properties) -> Advanced system settings (Advanced System Settings) -> Environment Variables (environment variables)

3.2 New JAVA_HOME variable

Copy the absolute path jdk

Click on  New (New) button to add a system variable

Input:

Variable name: JAVA_HOME
 variable value: <path just copied>

When finished click OK.

3.3 New / Modify CLASSPATH variable

If there  CLASSPATH variable, select and click  Edit (Edit) .

If not, click  New (New) New.

Input / existing variable value is added later:

变量名：CLASSPATH
变量值：.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;

点击 OK 保存。

3.4 修改Path 变量

 双击系统变量(system varible)中的Path,并点击new

新建两条路径：

%JAVA_HOME%\bin %JAVA_HOME%\jre\bin

4. 检查是否安装成功

win + r 打开 cmd

输入 java，出现如下的指令提示，说明配置成功了