CentOS安装JDK

安装JDK 1.7版本

yum search openjdk-devel
sudo yum install java-1.7.0-openjdk-devel.x86_64
/usr/sbin/alternatives --config java
/usr/sbin/alternatives --config javac
sudo vim /etc/profile
# add the following lines at the end
export JAVA_HOME=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.19.x86_64
export JRE_HOME=$JAVA_HOME/jre
export PATH=$PATH:$JAVA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
# save and exit vim
# make the bash profile take effect immediately
$ source /etc/profile