CentOS7卸载自带jdk安装自己的JDK1.8

1、查看centos自带的jdk

rpm -qa | grep java

2、删除自带的jdk

例如：rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64
           rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
           rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
           rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64

3、再去查看是否已经删除

rpm -qa | grep java

4、自己在配置相应的jdk