CentOS卸载自带的JDK

查看默认安装的JDK

[root@hdp-01 java]# rpm -qa | grep java
java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64
python-javapackages-3.4.1-11.el7.noarch
tzdata-java-2016g-2.el7.noarch
javapackages-tools-3.4.1-11.el7.noarch
java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64

可以看出默认安装有1.7.0和1.8.0两个版本的openjdk

卸载命令如下：

yum -y remove java-1.7.0-openjdk*

yum -y remove java-1.8.0-openjdk*