1.先把原openjdk卸掉
sudo apt-get remove openjdk*
2.解压下载的tar.gz压缩包
root@kali:~# cd 下载
root@kali:~/下载# ls
软件库 jdk-8u231-linux-x64.tar.gz onlyoffice.deb
root@kali:~/下载# tar -xzvf jdk-8u231-linux-x64.tar.gz
3.编辑全局配置文件profile,在profile中添加如下片段
root@kali:~# export JAVA_HOME=/root/下载/jdk1.8.0_231
root@kali:~# export JRE_HOME=/root/下载/jdk1.8.0_231/jre
root@kali:~# export CLASSPATH=.:JAVAHOME/lib:{JAVA_HOME}/lib:JAVAHOME/lib:{JRE_HOME}/lib
root@kali:~# export PATH=PATH:{PATH}:PATH:{JAVA_HOME}/bin:${JRE_HOME}/bin
root@kali:~# JAVA -VERSION
kali卸载openjava,再安装OracleJava
