[TOC]
转载地址：https://blog.csdn.net/zitong_ccnu/article/details/40041533**
查看JDK安装版本
[root@localhost ~]#java -version
java version *1.7.0_51*
OpenJDK Runtime Environment ( rhel-2.4.5.5.el7-x86_64 u51-b31)
OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)
查找OpenJDK安装包
rpm -qa | grep openjdk
java-1.7.0-openjdk-headless-1.7.0.51-2.4.5.5.el7.x86_64
java-1.7.0-openjdk-1.7.0.51-2.4.5.5.el7.x86_64
卸载OpenJDK安装包
[root@localhost ~]#yum -y remove java-1.7.0-openjdk-headless.x86_64
[root@localhost ~]#yum -y remove java-1.7.0-openjdk.x86_64
安装jdk环境
tar -xvf jdk-8u11-linux-x64.tar.gz
echo 'export JAVA_HOME=/usr/local/java/jdk1.8.0_11'>>/etc/profile
echo 'export CLASSPATH=$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar'>>/etc/profile
echo 'export PATH=$PATH:$JAVA_HOME/bin'>>/etc/profile
source /etc/profile
java -version
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