CentOS7安装JDK8

1. 检查系统中的jdk版本 java -version 显示： openjdk version "1.8.0_102" OpenJDK Runtime Environment (build 1.8.0_102-b14) OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)   2. 查询自带的openjdk rpm -qa | grep

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