ubuntu——HowtoInstallOracleJavaJDK8-创新互联

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.
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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.

```
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.
```
sudo apt-get purge openjdk-*
```

Download the Oracle Java JDK for Linux.

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:

 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

```
 source /etc/profile
```

Configure default JDK version :

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
sudo update-alternatives --config java

Test

```
java -version
```

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ubuntu——HowtoInstallOracleJavaJDK8-创新互联

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