Install java7 on Ubuntu Linux

Http://393799950.iteye.com/blog/1266623

After installing JDK 7 in Ubuntu for a long time, JDK 7 was successfully installed in Ubuntu. Now, I am able to settle down in my computer with peace of mind. Now I will summarize the installation tips:
1.
To install JDK 7, you need to pull the JDK binary file .. This simple, direct download on the Oracle official website can pull the http://www.oracle.com/technetwork/java/javase/downloads/java-se-jdk-7-download-432154.html
PS: Pay attention to the system version selection. I found my system is x86 only after having struggled for a long time with the x64 JDK...

2
Access the tar.gz file...
Tar-xzf jdk-7-linux-i586.tar.gz

3
Next, move the extracted folder to the/usr/lib/JVM directory.
Before that, you must have root permissions Su-L and then enter the password of the root account, you also need to create a folder mkdir/usr/lib/JVM in the/usr/lib directory.
After completing these preparations, we can move the JDK file to the desired location.
MV jdk1.7.0/usr/lib/JVM
In order to facilitate the configuration of environment variables, we change the JDK file name, the general online JDK file changed to jdk-7-sun.
MV/usr/lib/JVM/jdk1.7.0/usr/lib/JVM/Java-7-sun

4
Configure Environment Variables
If Vim is installed on your machine, run Vim ~ /. Bashrc
If not, use gedit. Run gedit ~ /. Bashrc
Add the following content to the environment variable:

Export java_home =/usr/lib/JVM/Java-7-sun

Export jre_home =$ {java_home}/JRE

Export classpath =. :$ {java_home}/lib :$ {jre_home}/lib

Export path =$ {java_home}/bin: $ path

5

Save the environment variable, exit the editor, and enter the following command to make the environment variable take effect.

Source ~ /. Bashrc

You can run the Env command to check whether the environment variable is successfully set.

6

Configure the default program

Sudo Update-alternatives -- install/usr/bin/Java/usr/lib/JVM/Java-7-sun/bin/Java 300

Sudo Update-alternatives -- install/usr/bin/javac/usr/lib/JVM/Java-7-sun/bin/javac 300

Sudo Update-alternatives -- config Java

If another JDK is installed in your system, the system will prompt you to select JDK 7.

7

Run the following command to test the JDK version:

Java-version

If the result is the same as the following, your jdk7 configuration will be complete.

Java version "1.7.0" Java (TM) se Runtime Environment (build 1.7.0-b147) Java hotspot (TM) server VM (build 21.0-b17, mixed mode)

This article Reprinted from http://redallanlu.blog.163.com/blog/static/3854299620119715653771/