卸载CentOS7自带的OpenJDK

[root@hadoop-master tools]# rpm -qa | grep java
java-1.8.0-openjdk-headless-1.8.0.101-3.b13.el7_2.x86_64
javapackages-tools-3.4.1-11.el7.noarch
tzdata-java-2016f-1.el7.noarch
java-1.8.0-openjdk-1.8.0.101-3.b13.el7_2.x86_64
python-javapackages-3.4.1-11.el7.noarch     

[root@hadoop-master tools]#  rpm -e --nodeps java-1.8.0-openjdk-1.8.0.101-3.b13.el7_2.x86_64
[root@hadoop-master tools]#  rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.101-3.b13.el7_2.x86_64
[root@hadoop-master tools]# rpm -qa | grep java
javapackages-tools-3.4.1-11.el7.noarch
tzdata-java-2016f-1.el7.noarch
python-javapackages-3.4.1-11.el7.noarch