---恢复内容开始---
1.卸载openjdk
1.1 查看已安装的依赖
rpm -qa |grep java
java-1.8.0-openjdk-headless-1.8.0.201.b09-2.el7_6.x86_64
python-javapackages-3.4.1-11.el7.noarch
tzdata-java-2018i-1.el7.noarch
java-1.8.0-openjdk-1.8.0.201.b09-2.el7_6.x86_64
javapackages-tools-3.4.1-11.el7.noarch
1.2，卸载已安装依赖
rpm -e --nodeps +以上依赖名
java-1.8.0-openjdk-headless-1.8.0.201.b09-2.el7_6.x86_64
python-javapackages-3.4.1-11.el7.noarch
tzdata-java-2018i-1.el7.noarch
java-1.8.0-openjdk-1.8.0.201.b09-2.el7_6.x86_64
javapackages-tools-3.4.1-11.el7.noarch
2 解压jdk
mkdir -p /usr/lib/jvm mv jdk-12 /etc/lib/jvm
3 配置环境变量
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_131 export JRE_HOME=${JAVA_HOME}/jre export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib export PATH=${JAVA_HOME}/bin:$PATH #写入、/etc/profile
jdk安装完毕
---恢复内容结束---
原文：https://www.cnblogs.com/mayeye/p/10651927.html