1.安置好你的tar版的jdk
2.运行命令:
sudo gedit ~/.bashrc
从而用gedit编辑~/.bashrc来设置环境变量:
export JAVA_HOME=/your/path/to/jdk
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib
export PATH=${JAVA_HOME}/bin:$PATH
3.运行命令:
sudo update-alternatives --install /usr/bin/java java /your/path/to/jdk/bin/java 300
sudo update-alternatives --install /usr/bin/javac javac /your/path/to/jdk/bin/javac 300
4.运行命令按提示选择你的tar版jdk:
sudo update-alternatives --config java