Linux installation JDK and configuration environment variables

Jdk:

http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/53/9C/wKiom1RsOyeDIfL2AAIWAd0YY3o476.jpg "title=" Screenshot2442.jpg "alt=" Wkiom1rsoyedifl2aaiwad0yy3o476.jpg "/>

Select 64-bit or 32-bit downloads based on the Linux system version, and the official version is available in RPM and tar.gz two versions.

Installation:

[Email protected] cdrom]# RPM-IVH jdk-8u25-linux-x64.rpm

Configuring the JDK environment variables

Method One: Set the variable under the shell (this method is only valid for the current shell, and will need to be reconfigured if you open another shell)

Export java_home=/usr/java/jdk1.7.0_40/
Export path= $JAVA _home/bin: $PATH
Export classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

(where only export Path=/usr/java/jdk1.7.0_40/bin is configured: $PATH can)

Method Two: Modify the/etc/profile file (this method once and for all, set once, valid for all users)

Open the/etc/profile file with the Vim editor and add the definition of the environment variable at the end of the file

java_home=/usr/java/jdk1.8.0_25/

Path= $JAVA _home/bin: $PATH

Classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar
Export Java_home
Export PATH
Export CLASSPATH

Save exit, view Java version

[Email protected] cdrom]# java-version

Java Version "1.8.0_25"

Java (TM) SE Runtime Environment (build 1.8.0_25-b17)

Java HotSpot (TM) 64-bit Server VM (build 25.25-b02, Mixed mode)

Indicates successful installation

Method Three: Modify the ~/.BASHRC file (this method is only valid for the current user and is valid for all shells of the user)

Open the ~/.BASHRC file with the VIM editor

Add the definition of the JDK environment variable at the end of the file

Set java_home=/usr/java/jdk1.8.0_25/

Export Java_home

Set path= $JAVA _home/bin: $PATH

Export PATH

Set classpath=.: $JAVA _home/lib/dt.jar: $JAVA _home/lib/tools.jar

Export CLASSPATH

Linux installation JDK and configuration environment variables