Ubuntu14.10安装jdk8

ubuntu 14.10 安装 JDK

http://www.cnblogs.com/0616--ataozhijia/p/4122121.html

http://jingyan.baidu.com/article/eb9f7b6d8f82a6869364e8a7.html

http://persevere.iteye.com/blog/1479524

1、解压文件

sudo mkdir -p /usr/lib/jvm/

sudo tar zxvf jdk-8u31-linux-x64.tar.gz -C /usr/lib/jvm

cd /usr/lib/jvm

2、添加环境变量

sudo gedit ~/.bashrc

加入如下内容

export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_31

export JRE_HOME=${JAVA_HOME}/jre

export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

export PATH=${JAVA_HOME}/bin:$PATH

3、配置默认JDK版本

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.8.0_31/bin/java 300

sudo update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.8.0_31/bin/javac 300

sudo update-alternatives --install /usr/bin/jar jar /usr/lib/jvm/java/jdk1.8.0_31/jar 300

sudo update-alternatives --install /usr/bin/javah javah /usr/lib/jvm/jdk1.8.0_31/bin/javah 300

sudo update-alternatives --install /usr/bin/javap javap /usr/lib/jvm/jdk1.8.0_31/bin/javap 300

然后执行

sudo update-alternatives --config java

4、测试

java -version