Install the Oracle JDK 6

郏7906

　　Oracle themselves have the
official guide to install their JDK - below is based upon those instructions.

• 
  Download the 32bit or 64bit Linux "compressed binary file" - it has a ".bin" file extension
  
• 　　Give it permissions to execute and extract it
  　　chmod a+x [version]-linux-i586.bin
  　　./[version]-linux-i586.bin
  
  

　　During installation it will ask you to register - press ENTER. Firefox will open with the registration page. Registration is optional.
　　JDK 6 package is extracted into ./jdk1.6.0_x directory, for example
./jdk1.6.0_30.
　　Lets rename it:

mv jdk1.6.0_30 java-6-oracle

• Now move the JDK 6 directory to /usr/lib
  

　　sudo mkdir /usr/lib/jvm
　　sudo mv java-6-oracle /usr/lib/jvm

switch to Oracle JDK 6
　　webupd8.googlecode.com hosts a nice-easy script to help with this.

wget http://webupd8.googlecode.com/files/update-java-0.5b
chmod +x update-java-0.5b
sudo ./update-java-0.5b

　　don't worry - 0.5b refers to the script version - not the version of java!
　　An alternative to this is to use the
webupd8 ppa and the update-java package.

　　Finally test the switch has been successful:

java -version
javac -version