Ubuntu 下安装java

Ubuntu下安装java

1. 下载jdk

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

   jdk-7u79-linux-x64.tar.gz

2. 解压并安装到/usr/local/java

   sudotar -zxvf jdk-7u79-linux-x64.tar.gz jdk1.7.0_79

   sudomv jdk1.7.0_79 /usr/local/java/

3. 配置环境变量

   打开/etc/profile或者～/.bashrc

   sudogedit /etc/profile

   加入

   #java

   exportJAVA_HOME=/usr/local/java/jdk1.7.0_79

   exportJRE_HOME=${JAVA_HOME}/jre

   exportCLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib

   exportPATH=${JAVA_HOME}/bin:$PATH

4. 验证安装

   java-version

        windows下安装

       

         

   window下安装

   安装AVA时，自定义目录一定注意jdk目录和jre目录

   JDK环境变量配置 windows

   CLASSPATH:   .;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;

   JAVA_HOME:  D:\work\local\java\jdk1.7.0_79

   Path:   %JAVA_HOME%\bin