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 CentOS 6 删除自带 OpenJDK 1.8 

查看系统自带OpenJDK

[root@CentOS-6-A ~]# rpm -qa | grep java
tzdata-java-2018e-3.el6.noarch
java-1.6.0-openjdk-1.6.0.41-1.13.13.1.el6_8.x86_64
java-1.7.0-openjdk-1.7.0.181-2.6.14.10.el6.x86_64

删除上述的2个包文件

yum -y remove java-1.6.0-openjdk-1.6.0.41-1.13.13.1.el6_8.x86_64
yum -y remove java-1.7.0-openjdk-1.7.0.181-2.6.14.10.el6.x86_64

安装自己下载的 Oracle JDK

CentOS 安装 Java 8

CentOS 7 删除自带 OpenJDK 1.8

查看系统自带OpenJDK

[root@jianbao-pc ~]# rpm -qa | grep java
java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64
python-javapackages-3.4.1-11.el7.noarch
tzdata-java-2019b-1.el7.noarch
java-1.7.0-openjdk-headless-1.7.0.221-2.6.18.1.el7.x86_64
javapackages-tools-3.4.1-11.el7.noarch
java-1.8.0-openjdk-1.8.0.222.b03-1.el7.x86_64
java-1.7.0-openjdk-1.7.0.221-2.6.18.1.el7.x86_64

删除上述的2个包文件

yum -y remove java-1.8.0-openjdk-headless-1.8.0.222.b03-1.el7.x86_64
yum -y remove java-1.7.0-openjdk-headless-1.7.0.221-2.6.18.1.el7.x86_64

安装自己下载的 Oracle JDK

CentOS 安装 Java 8