You have Java installed. The "java -version" command returns data showing that Java was been installed correctly. You try to use the javac command to compile a .java file. You get this error:
-bash: javac: command not found
How do you compile your Java code when javac is not recognized?
As root, run this command:
apt-get install -y openjdk-7-jdk
You may or may not encounter errors. These errors may be ignorable.