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choose jdk or openjdk

admin 11月 12, 2020 0 

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    sudo vim /etc/profile
    		 
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    export JAVA_HOME=/opt/jdk
    export JRE_HOME=${JAVA_HOME}/jre
    export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
    export PATH=$PATH:${JAVA_HOME}/bin:${JRE_HOME}/bin ## (1)will change this line in 3 will show
    		 
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    source /etc/profile

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## no different jdk the (1) like this 
  PATH=${JAVA_HOME}/bin:${JRE_HOME}/bin:$PATH

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## have different jdk the (1) like this 
  export PATH=$PATH:${JAVA_HOME}/bin:${JRE_HOME}/bin
  
## then do it 
   sudo update-alternatives --install /usr/bin/javah javah /opt/jdk/bin/javah 255
   sudo update-alternatives --install /usr/bin/javac javac /opt/jdk/bin/javac 255
   sudo update-alternatives --install /usr/bin/java java /opt/jdk/bin/java 255
   sudo update-alternatives --install /usr/bin/jar jar /opt/jdk/bin/jar 255
 

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    ## install other jdk 
       sudo apt-get install openjdk-8-jdk

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## do it 
###
 sudo update-alternatives ––config java
 sudo update-alternatives ––config javac
 sudo update-alternatives ––config javah
 sudo update-alternatives ––config jar

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