CentOS安装JDK

1.查看目前系统的jdk:

rpm -qa | grep jdk

2.卸载jdk

yum -y remove copy-jdk-configs-1.2-1.el7.noarch

在运行

rpm -qa | grep jdk

export JAVA_HOME=/usr/local/program/jdk1.8  
export JRE_HOME=/usr/local/program/jdk1.8/jre    
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib    
export PATH=$PATH:$JAVA_HOME/bin

显示结果

java version "1.8.0_65"
Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01,mixed modE)

echo $JAVA_HOME

显示结果

/usr/local/program/jdk1.8

显示结果

/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/zsg/.local/bin:/home/zsg/bin:/usr/local/program/jdk1.8/bin