Set up Java path for terminal

Question

Trying to set up a path for the terminal. I already have Eclipse running great. Dual os between windows 7 and Ubuntu 12.04. However, I would prefer to run everything out of Ubuntu, just not very experienced and all the forums I have searched are not giving me the step by step answers I need to make this happen. I included a screen shot of some information about my version etc. Any help would be greatly appreciated at this point I've put 10+ hours into this and this is my last resort.

Answer 1

javac HelloWorld 

is wrong in that way, that java*c* is a call for the Java*c*ompiler, and you invoke it on a Java source file, which would be HelloWorld.java in your case.

Then you can't check the version of javac by looking for java or asking java -version. Do javac -version and which javac instead.

To switch between different versions completely, you use

update-java-alternatives 

To switch an individual program (javac but not java or vice versa, or jar or appletviewer and so on)

update-alternatives --set java

Without the alternatives system you would change the PATH, and insert /usr/lib/jvm/java-7/bin for example, or sort it before java-1.6.

Answer 2

Hi actually you are not following the syntax properly .

To Compile a java file you have to do

javac filename.java and for your case that command will be javac HelloWorld.java

to Run a Java file you have to do

java filename and for your case java HelloWorld