Do i have to install jdk for ubuntu 14.04 or just compile in the terminal?

Answer 1

If javac is working in the terminal you have a jdk installed.

Answer 2

Yes.

Answer 3

thank you :)

Answer 4

how do I check if javac is working in the terminal? Do I do that by trying to compile a code file?

Answer 5

to check java, and javac, in the terminal
java -v
javac -v

Your system might be having openjdk. Must install Oracle jdk.