Ubuntu12.04 install JDK 7

Ubuntu12.04 install JDK 7 process Notes: The supervisor copies the file to the/usr/lib/jvm/directory. If no jvm folder exists, create the folder. command: sudomkdirjvm // create the folder jvmsudocp-r ~ /Dow

Notes for installing JDK 7 in Ubuntu 12.04:

1. Download jdk-7u4-linux-i586.tar.gz to oracle_download first

2. Copy jdk-7u4-linux-i586.tar.gz to the/usr/lib/jvm/directory. If no jvm folder exists, create the folder. Run the following command:

Sudo mkdir jvm// Create a folder jvm

Sudo cp-r ~ /Download/Jdk-7u4-linux-i586.tar.gz/Usr/lib/jvm// Copy the downloaded file to the directory created in the heart

Sudo tar-zxvgJdk-7u4-linux-i586.tar.gz// Decompress the file

3,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:

ExportJAVA_HOME=/Usr/lib/jdk1.7.0 _ 04

ExportPATH=$ JAVA_HOME/Bin:$ JAVA_HOME/Jre/bin:$ PATH

ExportCLASSPATH=$ CLASSPATH:.:$ JAVA_HOME/Lib:$ JAVA_HOME/Jre/lib

4. Modify the default jdk of the system.

$ Sudo update-alternatives -- install/usr/bin/java/usr/lib/jvm/java1.7.0 _ 04/bin/java 300

$ Sudo update-alternatives -- install/usr/bin/javac/usr/lib/jvm/java1.7.0 _ 04/Bin/javac 300

$ Sudo update-alternatives -- config java
$ Sudo update-alternatives -- config javac

5. Check and enter java-version

Java version "1.7.0 _ 04"
Java (TM) SE Runtime Environment (build 1.7.0 _ 04-b20)
Java HotSpot (TM) Server VM (build 23.0-b21, mixed mode)

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