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
