查询自带jdk
查询已安装的jdk
rpm -qa | grep jdk
#或者
rpm -qa | grep gcj:
#查询已安装jdk
[ec2-user[@ip](https://my.oschina.net/u/3749391) accountcard]$ rpm -qa | grep jdk
java-1.7.0-openjdk-1.7.0.181-2.6.14.8.80.amzn1.x86_64
#卸载已安装的jdk
yum -y remove java-1.7.0-openjdk-1.7.0.181-2.6.14.8.80.amzn1.x86_64
或
rpm -e --nodeps java-1.7.0-openjdk-1.7.0.181-2.6.14.8.80.amzn1.x86_64