centos7卸载java1.8安装java11

1.查看java版本

java -version

java version "1.8.0_60"

2.删除java1.8

rpm -qa | grep jdk

jdk1.8.0_60-1.8.0_60-fcs.x86_64

rpm -e jdk1.8.0_60-1.8.0_60-fcs.x86_64

rpm -qa | grep jdk为空

3.解压 jdk-11.0.5_linux-x64_bin.tar.gz

tar -zxvf jdk-11.0.5_linux-x64_bin.tar.gz

mv jdk-11.0.5 /usr/local/jdk

4.修改环境变量

vim /etc/profile

export JAVA_HOME=/usr/local/jdk/jdk-11.0.5
export JRE_HOME=\$JAVA_HOME/
export PATH=$JAVA_HOME/bin:$PATH
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

5.更新环境变量

source /etc/profile

6.查看java版本

java -version已更新