martti@martti:~$ java
The program 'java' can be found in the following packages:
 * j2re1.4
 * kaffe
 * cacao
 * java-gcj-compat
 * gij-4.1
 * jamvm
 * gij-4.2
 * sablevm
Try: sudo apt-get install <selected package>
bash: java: command not found

martti@martti:~$ /usr/bin/java
bash: /usr/bin/java: No such file or directory

martti@martti:~$ cd /usr/bin
martti@martti:/usr/bin$ dir j*
jar	   javac    javap	  javaws    jdb    jmap  jrunscript  jstat
jarsigner  javadoc  java-rmi.cgi  jconsole  jhat   join  jsadebugd   jstatd
java	   javah    java_vm	  jcontrol  jinfo  jps	 jstack

martti@martti:/usr/bin$ find java
java
martti@martti:/usr/bin$ ./java
bash: ./java: No such file or directory

ahm...  bitte was???

martti@martti:/usr/bin$ java
The program 'java' can be found in the following packages:
 * j2re1.4
 * kaffe
 * cacao
 * java-gcj-compat
 * gij-4.1
 * jamvm
 * gij-4.2
 * sablebash: [: missing `]'