javadoc doesn't found in my linux machine

Question

I'm running on ubuntu 12.04 and when I put in the terminal java -version I got this message:

java version "1.7.0_05"
Java(TM) SE Runtime Environment (build 1.7.0_05-b05)
Java HotSpot(TM) 64-Bit Server VM (build 23.1-b03, mixed mode)

but despite that, if I put in the terminal javadoc I receive a message as it isn't installed in my machine.

Answer 1

The Java Runtime Environment (JRE) doesn't include javadoc. It includes only the things required to run Java programs, not to develop them.

You need the JDK (Java Development Kit) which includes developer tools like javadoc, in addition to everything found in the JRE.

See the Ubuntu Java documentation.