官网：https://www.oracle.com/java/technologies/downloads/
https://www.oracle.com/java/technologies/downloads/archive/
JDK8环境变量配置
| key | value |
|---|---|
| JAVA_HOME | C:\Program Files\Java\jdk1.8.0_171 |
| CLASSPATH | .;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar |
| Path | %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin; |
JDK8 & JDK17环境变量配置
| key | value |
|---|---|
| JAVA_HOME | %JAVA17_HOME% |
| JAVA8_HOME | C:\Program Files\Java\jdk1.8.0_171 |
| JAVA17_HOME | C:\Program Files\Java\jdk-17.0.3.1 |
| CLASSPATH | .;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar |
| Path | %JAVA_HOME%\bin |
注意：JDK17自带JRE无需配置%JAVA_HOME%\jre\bin;
