ubuntu linux 安装jdk

参见文章

1.在如下地址，下载jdk

2.将下载的jdk-xxx-linux-i586.tar.gz解压

tar xvzf jdk-xxx.tar.gz

3.将解压的目录，拷贝到/usr/local/lib目录下

sudo mv ./jdkxxx /usr/local/lib

4.将此jdk目录改名

sudo mv jdkxxx jdk

5.修改环境变量文件

sudo gedit /etc/profile

6.添加如下内容

export JAVA_HOME=/usr/local/lib/jdk
export JRE_HOME=$JAVA_HOME/jre
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export CLASSPATH=$CLASSPATH:.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar

7.将系统默认的jdk改过来

sudo update-alternatives --install /usr/bin/java java /usr/local/lib/jdk/bin/java 300

sudo update-alternatives --install /usr/bin/javac javac /usr/local/lib/jdk/bin/javac 300

sudo update-alternatives --config java 

sudo update-alternatives --config javac

8.检查java版本

java -version