Manually install Sun-jdk1.6 under Ubuntu10.4

1. Go to http://www.oracle.com/technetwork/java/javase/downloads/index.htmlto download jdk-6u30-linux-i586.bin
 
2. Place it in the/usr/lib/jvm/java directory, and use the chmod command to modify it so that it has the running permission.
 
3. $ sudo./jdk-6u30-linux-i586.bin
 
Press enter until you are asked whether to install it. Enter yes and press enter until the installation is complete.
 
4. Configure Environment Variables
 
 
Configure classpath and modify the environment variables of all users: $ sudo gedit/etc/profile
 
 
Add at the end of the file
 
 
View sourceprint? 1 # set java environment
 
2
 
3 export JAVA_HOME =/usr/lib/jvm/java/jdk1.6.0 _ 30
 
4
 
5 export JRE_HOME =/usr/lib/jvm/java/jdk1.6.0 _ 30/jre
 
6
 
7 export CLASSPATH =.: $ JAVA_HOME/lib: $ JRE_HOME/lib: $ CLASSPATH
 
8
 
9 export PATH = $ JAVA_HOME/bin: $ JRE_HOME/bin: $ PATH
 
 
 
 
 
Restart the computer and run the command to test the jdk version.
 
Java-version
 
If the version information is displayed, the installation is successful.
 
Do not make any mistakes. Otherwise, you may not be able to enter the system after the reboot. if the system is incorrect, there will be only a blank page after the boot. Do not worry, press ctrl + Alt + F1 to enter the tty1 command line interface. Enter $ sudo vi/etc/profile to check whether the configuration has been incorrect. Correct the configuration and restart. Note that the export command = has no space on both sides.


From a strange blog