jdk安装(win)

• 下载地址
  https://www.oracle.com/java/technologies/downloads/
  https://www.jdkdownload.com/

• 解压或者运行exe安装

#设置环境变量
JAVA_HOME=C:\java\jdk-11.0.13\bin
path=%JAVA_HOM%\bin;%JAVA_HOM%\jre\bin
CLASSPATH=.;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar

#jdk11后没有jre，进入jdk目录cmd输入
bin\jlink.exe --module-path jmods --add-modules java.desktop --output jre

linux安装

下载 https://www.oracle.com/java/technologies/downloads/

#安装jdk
tar -zxvf jdk-8u381-linux-x64.tar.gz -C /usr/local/jdk8
/usr/local/jdk8/jdk1.8.0_381/

#vi /etc/profile结束添加
export JAVA_HOME=/usr/local/jdk8/jdk1.8.0_381
export JRE_HOME=$JAVA_HOME/jre
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

查看Java环境变量是否成功
source /etc/profile
java -version