linux修改默認的openjdk的方法

vim /etc/profile 在末尾加下面

export JAVA_HOME=/opt/j2sdk-image/
export PATH=$PATH:$JAVA_HOME/bin
export JRE_HOME="$JAVA_HOME/jre"
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/rt.jar

source /etc/profile
保存
300只是標識
sudo update-alternatives –install /usr/bin/java java /opt/j2sdk-image/bin/java 300

sudo update-alternatives –install /usr/bin/javac javac /opt/j2sdk-image/bin/javac 300
java -version

按照上面不成功，再從下面選擇你所安裝的目錄

sudo update-alternatives –config java
sudo update-alternatives –config javac

查看系統
cat /etc/.productinfo

查看cpu
cat /proc/cpuinfo