卸载java

java -version

yum remove java

yum groupjava java

       安装java

tar -zxvf jdk-8u60-linux-x64.tar.gz

vim /etc/profile

export JAVA_HOME=/opt/jdk1.80/bin

export PATH=$PATH:$JAVA_HOME/bin

export CLASSPATH=.:$JAVA_HOME/dt.jar:$JAVA_HOME/tools.jar

           reboot

java -version