Install jdk-7u10-linux-x64.tar.gz in Ubuntu 12.10

Install jdk-7u10-linux-x64.tar.gz in Ubuntu 12.10

General principle: Decompress the jdk-7u10-linux-x64.tar.gz package to/usr/lib/JDK, set the JDK environment variable, and change it to the default JDK

1.copy jdk-7u5-linux-x64.tar.gz to the/usr/lib/JDK/directory. If no JDK folder exists, create the folder. Run the following command:

Sudo mkdir JDK // create a folder JDK

Sudo CP-R ~ /Download/jdk-7u10-linux-x64.tar.gz/usr/lib/JDK // copy the downloaded file to the new directory

Sudo tar-zxvg jdk-7u10-linux-x64.tar.gz // Extract files

2. Set environment variables and use gedit to open the/etc/profile file

Sudo gedit/etc/profile

Add the following at the end of the file:

Export java_home =/usr/lib/JDK/jdk1.7.0 _ 10

Export jre_home =/usr/lib/JDK/jdk1.7.0 _ 10/JRE

Export Path = $ java_home/bin: $ java_home/JRE/bin: $ path

Export classpath = $ classpath:.: $ java_home/lib: $ java_home/JRE/lib

3. Modify the default JDK of the system.

$ Sudo Update-alternatives -- install/usr/bin/Java/usr/lib/JDK/jdk1.7.0 _ 10/bin/Java 300

$ Sudo Update-alternatives -- install/usr/bin/javac/usr/lib/JDK/jdk1.7.0 _ 10/bin/javac 300

$ Sudo Update-alternatives -- config Java
$ Sudo Update-alternatives -- config javac

4. Check and enter Java-version

Java version "1.7.0 _ 10"
Java (TM) se Runtime Environment (build 1.7.0 _ 10-b18)
Java hotspot (TM) 64-bit server VM (build 23.6-b04, mixed mode)