CentOS7 卸載OpenJDK與安裝OracleJDK1.8

CentOS7 卸載OpenJDK以及安裝OracleJDK1.8 1、查詢系統中OpenJDK安裝包 rpm -qa | grep openjdkjava 獲得：（加粗的就是咱們要卸載的包）linux java-1.7.0-openjdk-1.7.0.251-2.6.21.0.el7_7.x86_64 java-1.7.0-openjdk-headless-1.7.0.251-2.6.21.0.

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