how to add class-path for executing java?

HI every 1|
----------can u pls tell how to set class-path---------
I tried in the followind manner,but its not working for me

1)ubntusr@ubntusr:~$ su
Password:

2)root@ubntusr:/home/ubntusr# export $PATH ---------> checking the PATH
bash: export: `/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games': not a valid identifier

3)root@ubntusr:/home/ubntusr# export PATH=/home/ubntusr/Android/java_ee_sdk-5_07-linux.bin ;$PATH
/home/ubntusr/Android/java_ee_sdk-5_07-linux.bin: error while loading shared libraries: libstdc++.so.5: cannot open shared object file: No such file or directory

4)root@ubntusr:/home/ubntusr# export $PATH -------> I m checking wt s there in PATH var after adding java path
bash: export: `/home/ubntusr/Android/java_ee_sdk-5_07-linux.bin': not a valid identifier

5)root@ubntusr:/home/ubntusr# clear ----> not working
Command 'clear' is available in '/usr/bin/clear'
The command could not be located because '/usr/bin' is not included in the PATH environment variable.
bash: clear: command not found

root@ubntusr:/home/ubntusr#

The /usr/bin/clear command is

The /usr/bin/clear command is used to clear your terminal screen, once TERM is set to the correct terminal type, such as vt100, xterm, ansi, etc.

Setting the Java class path can be done in a number of ways, three of which are:
1) set CLASSPATH=/some/path/to/the/new/class/path:$CLASSPATH

Or

2) CLASSPATH=/some/path/to/the/new/class/path:$CLASSPATH;export CLASSPATH

Or if your shell supports it:

3) export CLASSPATH=/some/path/to/the/new/class/path:$CLASSPATH

Basically, put the $CLASSPATH in the path if you want to preserve any existing setting.