Linux under 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 tar zxvf./jdk-7-linux-i586.tar.gz-c/USR/LIB/JVM
2. Cd/usr/lib/jvm
3. sudo mv Jdk1.7.0/java-7-sun

Step Three: Modify environment variables

1. Vim ~/.BASHRC

Add to:

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

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

1. SOURCE ~/.BASHRC

Fourth Step: Configure the default JDK version because there may be default JDK in Ubuntu, such as OPENJDK, we do the following to set up our installed JDK as the default JDK version.
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. [Email protected]:~$ java-version
2. Java Version "1.7.0"
3. Java (TM) SE Runtime Environment (build 1.7.0-b147)
4. Java HotSpot (TM) Server VM (build 21.0-b17, Mixed mode)

Linux under Configuration jdk1.7