ubuntu12.04 Installation Configuration jdk1.7

First step: Download jdk-7-linux-i586.tar.gz

1. Wget-c http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz

(Note: If the download is not down, it is recommended to use Thunderbolt download, and then copied to the Linux system.) )

Step Two: Unzip the installation

1. sudo MKDIR/USR/LIB/JVM
2. sudo tar zxvf jdk-7u5-linux-x64.tar.gz-c/USR/LIB/JVM

Step Three: Modify environment variables

1. sudo gedit/etc/profile

Add to:

1. #set Java Environment
2. Export Java_home=/usr/lib/jvm/java-7-sun
3. Export JRE_HOME=${JAVA_HOME}/JRE
4. Export Classpath=.:${java_home}/lib:${jre_home}/lib
5. Export Path=${java_home}/bin: $PATH

Save the exit and enter the following command to take effect immediately.

Fourth Step: Configure the default JDK version to set the JDK we installed as the default JDK version, do the following.
Execute code:

1. sudo update-alternatives--install/usr/bin/java Java/usr/lib/jvm/java-7-sun/bin/java 300
2. sudo update-alternatives--install/usr/bin/javac Javac/usr/lib/jvm/java-7-sun/bin/javac 300

Execute code:

1. sudo update-alternatives--config java

The various JDK versions are listed as follows:

2. [Email protected]:~$ sudo update-alternatives--config java
4. There are 3 candidates that can be used to replace Java (providing/usr/bin/java).
10. Select Path Priority state
12. ------------------------------------------------------------
14. * 0/usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 Auto mode
16. 1/usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 Manual Mode
18. 2/usr/lib/jvm/java-6-sun/jre/bin/java 63 Manual Mode
20. 3/usr/lib/jvm/java-7-sun/bin/java 300 Manual Mode
26. To maintain the current value [*] press ENTER, or type the number of your choice: 3
28. Update-alternatives: Use/usr/lib/jvm/java-7-sun/bin/java to provide/usr/bin/java (Java) in manual mode.

Fifth Step: Test

1. Java-version (Displays the following information indicating that the configuration was successful)
2. Java Version "1.7.0"
3. Java (TM) SE Runtime Environment (build 1.7.0-b147)
4. Java HotSpot (TM) Client VM (build 21.0-b17, Mixed mode)

ubuntu12.04 Installation Configuration jdk1.7