Java in Ubuntu

download jdk from http://www.sun.com

add this backport into /etc/apt/sources.list
deb http://archive.ubuntu.com/ubuntu/ warty multiverse

$ sudo apt-get install build-essential
$ sudo apt-get update
$ sudo apt-get install java-package java-common fakeroot

jdk-1_5_0-linux-i586.bin is downloaded from http://www.sun.com
$ fakeroot make-jpkg jdk-1_5_0-linux-i586.bin

$ sudo dpkg -i sun-j2sdk1.5_1.5.0_i386.deb
(this maybe report an error but is completed in next step)

$ sudo apt-get install sun-j2sdk1.5

$ sudo update-alternatives --config java
(see next step for dependancy errors)

$ sudo apt-get -f install
(fix dependancy errors if require)

NOTE：版號可能會有差異！