Linux installation jdk (install JDK)

Yum-y install java-1.7.0-openjdk-devel.x86_64 Using this command is better. Use other commands when there is no Javac command, specifically to uninstall the previously installed JDK is useful.

After installation, configure environment variables

Vi/etc/profile

#set Java Environment
Java_home=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.75.x86_64
Jre_home= $JAVA _home/jre
Class_path=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar: $JRE _home/lib
Path= $PATH: $JAVA _home/bin: $JRE _home/bin
Export Java_home jre_home Class_path PATH

Linux installation jdk (install JDK)