1、查看openjdk版本
java -version
java version "1.7.0_51" OpenJDK Runtime Environment (rhel-2.4.5.5.el7-x86_64 u51-b31) OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)
2、查看 rpm -qa | grep java
java-1.7.0-openjdk-headless-1.7.0.51-2.4.5.5.el7.x86_64 java-1.7.0-openjdk-1.7.0.51-2.4.5.5.el7.x86_64
3、使用yum命令卸载openjdk
yum -y remove java-1.7.0-openjdk-headless-1.7.0.51-2.4.5.5.el7.x86_64 yum -y remove java-1.7.0-openjdk-1.7.0.51-2.4.5.5.el7.x86_64
卸载完成。