卸载
CentOS会自带OpenJDK，卸载自带的OpenJDK，再安装我们需要的版本
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| $ rpm -qa | grep jdk
java-11-openjdk-headless-11.0.4.11-1.el7_7.x86_64
java-1.8.0-openjdk-headless-1.8.0.222.b10-0.el7_6.x86_64
copy-jdk-configs-3.3-10.el7_5.noarch
$ rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.222.b10-0.el7_6.x86_64
$ rpm -e --nodeps java-11-openjdk-headless-11.0.4.11-1.el7_7.x86_64
$ rpm -e --nodeps copy-jdk-configs-3.3-10.el7_5.noarch
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搜索
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| $ yum search openjdk | grep -i --color openjdk
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安装
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$ yum install java-1.8.0-openjdk java-1.8.0-openjdk-devel
$ yum install java-11-openjdk java-11-openjdk-devel
$ java -version
openjdk version "11.0.4" 2019-07-16 LTS
OpenJDK Runtime Environment 18.9 (build 11.0.4+11-LTS)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.4+11-LTS, mixed mode, sharing)
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