linux系统安装jdk

1.从官网下载jdk包,Java Archive Downloads - Java SE 8u211 and later

2.创建java目录并上传jdk包

mkdir -p /home/local/java

3.解压jdk包

cd /home/local/java

tar -zxvf /home/local/java/jdk-8u381-linux-x64.tar.gz

4.配置环境变量

vim /etc/profile

i

export JAVA_HOME=/home/local/java/jdk1.8.0_381
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

esc

:wq  #保存退出

5.重新加载配置文件

source /etc/profile

6.查看安装是否成功

java -version

javac

java

7.卸载jdk

vim /etc/profile

光标移到相关环境变量配置首行，dd删除行

esc

:wq

source /etc/profile

java -version