Download and Setup HabaneroJava (HJ) Package
Note that the HJ package is meant to run only on Linux and MacOS. If you have a Windows machine, you will have to remotely login to one of the lab machines and work on it. Please contact the staff if you need help to do that.
HJ - Download and Install
You will have to download and install HJ once for every machine you plan to use HJ on.
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- Download the zip file containing the HJ package from
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- Lets
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- call
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- the
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- zip
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- file
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- ’hj-version.zip’.
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- Unzip
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- the
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- file
unzip hj-version.zip
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- This
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- will
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- create
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- a
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- folder,
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- namely
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- 'hj-version'
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HJ
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-
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Setup
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You
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will
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have
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to
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setup
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the
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environment
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before
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you
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can
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compile
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and
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run
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HJ
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programs.
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This
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has
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to
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be
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done
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every
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time
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you
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login
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to
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a
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machine
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or
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start
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a
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new
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shell.
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These
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commands
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are
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specific
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to
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the
...
shell
...
you
...
use.
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You
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can
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figure
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out
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which
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shell
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you
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are
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using
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with
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the
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following
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command.
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ps
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-p
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$$
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Here
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are
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the
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commands
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if
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you
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are
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using
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a
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bash
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shell.
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- Set
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- the
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- environment
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- variable
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- HJ
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- HOME
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- to
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- the
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- ’hj-version’
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- folder.
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export HJ HOME=<full-path-to-hj-version-folder>
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OR
<Go to the hj-version
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- folder>
export HJ HOME=`pwd`
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- Set
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- the
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- environment
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- variable
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- PATH.
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export PATH=$HJ
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- HOME/bin:$PATH
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- You
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- should
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- have
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- the
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- environment
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- variable
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- JAVA
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- HOME
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- set
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- to
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- run
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- HJ
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- programs.
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- Some
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- machines
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- would
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- have
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- it
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- set
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- when
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- you
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- log
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- in.
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- If
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- it
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- is
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- not
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- set
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- already,
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- you
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- have
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- to
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- set
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- it
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- as
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- follows.
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Check if your JAVA HOME is set.
echo $JAVA HOME
If this prints an empty line, it is not set. Do the following.
export JAVA HOME=<full-path-to-java-sdk>
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In your lab machines,
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- the
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- java
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- sdk
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- can
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- be
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- found
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- at
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- /etc/alternatives/java
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- sdk
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- sun.
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Here
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are
...
the
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commands
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if
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you
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are
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using
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a
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c
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shell
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(csh)
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or
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a
...
variant
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(tcsh)
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of
...
it.
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Your
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lab
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machines’
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default
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shell
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when
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you
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login
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is
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tcsh.
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- Set
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- the
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- environment
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- variable
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- HJ
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- HOME
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- to
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- the
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- ’hj-version’
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- folder.
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set HJ HOME=<full-path-to-hj-version-folder>
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OR
<Go to the hj-version
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- folder>
set HJ HOME=`pwd`
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- Set
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- the
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- environment
...
- variable
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- PATH.
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set PATH=${HJ
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- HOME}/bin:${PATH}
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- You
...
- should
...
- have
...
- the
...
- environment
...
- variable
...
- JAVA
...
- HOME
...
- set
...
- to
...
- run
...
- HJ
...
- programs.
...
- Some
...
- machines
...
- would
...
- have
...
- it
...
- set
...
- when
...
- you
...
- log
...
- in.
...
- If
...
- it
...
- is
...
- not
...
- set
...
- already,
...
- you
...
- have
...
- to
...
- set
...
- it
...
- as
...
- follows.
...
Check if your JAVA HOME is set.
echo $JAVA HOME
If this prints an empty line, it is not set. Do the following.
set JAVA HOME=<full-path-to-java-sdk>
...
In your lab machines,
...
- the
...
- java
...
- sdk
...
- can
...
- be
...
- found
...
- at
...
- /etc/alternatives/java
...
- sdk
...
- sun.
...
HJ
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-
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Testing
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Do
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the
...
following
...
to
...
check
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if
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your
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HJ
...
is
...
setup
...
properly.
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- Go
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- to
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- a
...
- folder
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- with
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- an
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- HJ
...
- program.
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- Lets
...
- say
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- we
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- go
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- to
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- hj-version/examples/fib/
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- which
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- contains
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- an
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- HJ
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- program
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- that
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- computes
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- the
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- Fibonacci
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- of
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- a
...
- given
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- input
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- number.
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cd $HJ_HOME/examples/fib
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- Compile
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- the
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- HJ
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- program,
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- Fib.hj
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hjc Fib.hj
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- Run
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- the
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- HJ
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- program
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- with
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- appropriate
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- arguments,
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- Fib
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- with
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- an
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- input
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- 10.
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hj Fib 10- You should get the following result, which is the Fibonacci value of 10.
55
DrJava-HJ
- Download the jar file corresponding to DrJava-HJ from https://svn.rice.edu/r/comp322/course/downloads/drjava-r5422-hj-1.2.0.0.jar
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- Now
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- you
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- have
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- the
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- jar
...
- file.
...
- Lets
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- call
...
- it
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- 'drjava-version.jar'.
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- You
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- are
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- all
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- set
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- to
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- use
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- the
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- DrJava-HJ
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- gui
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- for
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- HJ
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- programs
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Testing
Do the following to check if the DrJava-HJ
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gui
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is
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setup
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properly.
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- Open
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- the
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- DrJava-HJ
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- gui
java -jar
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- drjava-version.jar
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- Now
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- you
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- should
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- have
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- the
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- DrJava-HJ
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- gui
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- running.
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- Open
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- a
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- HJ
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- program.
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- Lets
...
- say
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- we
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- open
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- hj-version/examples/fib/Fib.hj.
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Click on the open button on the top panel
Navigate to the folder containing Fib.hj
Select Fib.hj and click open- Compile the HJ program.
Click on the compile button on the top panel - The 'Compiler Output' tab in the bottom panel should show 'Compilation Completed'.
- Go to the 'Console' tab in the bottom panel and check if there were any errors during compilation. All errors will be shown in RED.
- Go to the 'Interactions' tab in the bottom panel. Run the program by typing the following.
run Fib 10 - You should get the following output.
55