ubuntu——How to Install Oracle Java JDK8

千家信息网最后更新 2024年11月19日ubuntu——How to Install Oracle Java JDK8

1. Check to see if your Ubuntu Linux operating system architecture is 32-bit or 64-bit, open up a terminal and run the following command below.

   1. uname -a or file /sbin/init

Linux caochu-Inspiron-N5110 3.13.0-32-generic #57-Ubuntu SMP Tue Jul 15 03:51:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Check if you have Java installed on your system. To do this, you will have to run the Java version command from terminal.

1. Type/Copy/Paste:java -versio

   If you have OpenJDK installed on your system, you have the wrong vendor version of Java installed for this exercise.
   

2. sudo apt-get purge openjdk-*

Download the Oracle Java JDK for Linux.

1. Unpack the compressed Java binaries, in the directory /usr/local/java8

Scroll down to the end of the file using your arrow keys and add the following lines below to the end of your./etc/profile file:

1.  export JAVA_HOME=/usr/local/java8/jdk1.8.0_73  export JRE_HOME=${JAVA_HOME}/jre   export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib   export PATH=${JAVA_HOME}/bin:$PATH

2.  source /etc/profile

Configure default JDK version :

1. sudo update-alternatives --install /usr/bin/java java /usr/local/java8/jdk1.8.0_73/bin/java 300
   sudo update-alternatives --install /usr/bin/javac javac /usr/local/java8/jdk1.8.0_73/bin/javac 300
   sudo update-alternatives --install /usr/bin/jar jar /usr/local/java8/jdk1.8.0_73/bin/jar 300
   sudo update-alternatives --install /usr/bin/javah javah /usr/local/java8/jdk1.8.0_73/bin/javah 300
   sudo update-alternatives --install /usr/bin/javap javap /usr/local/java8/jdk1.8.0_73/bin/javap 300

2. sudo update-alternatives --config java

Test

1. java -version