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[root@localhost ~]# rpm -qa | grep java
[root@localhost ~]# rpm -e --nodeps jdk名称

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[root@localhost ~]# mkdir /usr/java
[root@localhost ~]# cd /usr/java/
[root@localhost java]# >>> copy rpm file to this folder
[root@localhost java]# rpm -ivh /usr/java/jdk-8u112-linux-x64.rpm 

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[root@localhost java]# vim /etc/profile

export JAVA_HOME=/usr/java/jdk1.8.0_112
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

[root@localhost java]# source /etc/profile
[root@localhost java]# java -version
[root@localhost java]# $JAVA_HOME/bin/java -version
[root@localhost java]# echo $JAVA_HOME