Centos 7 下安装与卸载JDK1.8
卸载
查看已经安装的jdk
root@bogon jre]# rpm -qa|grep jdk
java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64
java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64
java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64
卸载命令
root@bogon jre]# yum -y remove java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64
卸载完成之后Java命令不被识别
[root@bogon lib]# java -version
bash: java: command not found…
安装
去官网下载jdk:http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
解压到安装目录
[root@bogon software]# tar -zxvf jdk-8u101-linux-x64.tar.gz -C /usr/local/java/
安装完毕之后在/etc/profile文件末尾添加
[root@bogon software]# vim /etc/profile
export JAVA_HOME=/usr/local/java/jdk1.8.0_101 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH
使/etc/profile生效
[root@bogon jdk1.8.0_101]# source /etc/profile
检测安装是否成功
阅读更多[root@bogon jdk1.8.0_101]# java -version
java version “1.8.0_101”
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)
[root@bogon jdk1.8.0_101]# javac
Usage: javac
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