Ubuntu14.04 install JDK and ubuntu14.04jdk

Ubuntu14.04 install JDK and ubuntu14.04jdk

Download from Sun's official website

Http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

Select accept license, and then select JDK download suitable for your model.

Decompress the file and modify the file name.

sudo mkdir /usr/lib/jvmsudo tar zxvf jdk-8u11-linux-i586.tar.gz -C /usr/lib/jvmcd /usr/lib/jvmsudomv jdk1.8.0_11 java

Add Environment Variables

sudo vim ~/.bashrc

Add the following content

export JAVA_HOME=/usr/lib/jvm/javaexport JRE_HOME=${JAVA_HOME}/jreexport CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/libexport PATH=${JAVA_HOME}/bin:$PATH

Configure the default JDK version

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/java/bin/java 300sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/java/bin/javac 300sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java/bin/jar 300sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/java/bin/javah 300sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/java/bin/javap 300 

Then execute

sudo update-alternatives --config java

If JDK is installed for the first time, the system prompts There is only one alternative in link group java (providing/usr/bin/java ): /usr/lib/jvm/java/bin/java requires no configuration.

If it is not the first installation, JDK options of different versions will be available.

Test

java -version

If the java version information is displayed, the installation is successful.