Week 5: Rails Passion Course

1. Week 5: JRuby Basics (Topics to be covered: What is and what is not JRuby?, Why JRuby (over Ruby) & JRuby on Rails (Ruby on Rails)?, Why use (J)Ruby with Java? Calling Java from JRuby, Calling (J)Ruby from Java)
2. o 5520_ruby_jruby.zip (Unzip it in a directory of your choice and read lab document from /ruby_jruby/index.html to proceed) (4/10/09: Installed/done)
   
3. * Resources
   o Websites
   + JRuby wiki from wiki.jruby.org
   o Tutorials
   + Why You Want JRuby blog by Eric Armstrong (May 2008)
   + JRuby Tutorial by Charles Nutter and Ola Bini
   + JRuby wiki from en.wikipedia.org
   + Calling Java from JRuby wiki from wiki.jruby.org
   + Mixing Java and Ruby Development screencast
   + JRuby - Enterprise 2.0 presentation by James Crisp and Josh Price
   + Ola Bini Discusses JRuby from infoq.com
   + Charles Nutter discusses JRuby from infoq.com
   o NetBeans support of JRuby
   + JRuby Support in NetBeans IDE 6 Ask the Experts Transcript (May 2008)
   o GUI
   + Swing with JRuby: Developing a Desktop Application with the JRuby and Java Swing APIs tutorial by Teera Kanokkanjanarat
   + Swing with JRuby Part II: Packaging JRuby Desktop Application tutorial by Teera Kanokkanjanarat
   + Cheri project home site from cheri.rubyforge.org
   o Presentations
   + JRuby - Bringing Ruby to the JVM presentation by Charles Nutter and Thomas Enebo (Sep. 2006)
   + JRuby Presentation @ Vancouver Ruby User group event by Teera Kanokkanjanarat
   + Ola Bini's presentation
4. Presentation (o PDF: 1 slide per page (OR) o OpenOffice file) (20 pages) (4/10/09: Read)
5. Online Lab/Homework/Change Log document (This is the same document you will find in the hands-on lab zip file) (44 pages)
6. Exercise 1: Build JRuby applications using Java classes
7. (1.1) JRuby_ImportClass (p.2-3) Answer: ----Import a Java class, java.lang.System
   ----Display Java version using java.lang.System Java class
   Java verion used is 1.6.0_13-b03
8. (1.2) JRuby_UseJavaJFrameClass (p.3) Answer: Got a small window with "Hello World!" in it.
9. (1.3) JRuby_UseJavaJFrameClass2 (p.3-4) Answer: Got a "medium" red window with nothing but color in it.
10. (1.4) JRuby_UseJavaTreeSetClass" (p.4-5) Answer: ----Create an object from TreeSet Java class
    ----Add entries to the TreeSet
    ----Display TreeSet
    value: Bar
    value: baz
    value: foo
11. (1.5) JRuby_UseJavaArrayListClass (p.5-6) Answer: ----Create an object from ArrayList Java class
    ----Add entries to the ArrayList
    ----Add an entry using an index
    ----Display ArrayList
    value: foo
    value: Bar
    value: Sang Shin
    value: baz
    ----Display an entry using an index
    Sang Shin
12. Exercise #2: Create Ruby Module from Java Packages (p.6-7)
    
13. (2.1) JRuby_CreateModuleFromJavaPackage (p.6-7) Answer: ----Create a module from Java package
    ----Create a string
    This is my string from java.lang package
    
14. (2.2) JRuby_CreateModuleFromJavaPackage2 (p.7) Answer: ----Create a Ruby Module from Java package
    ----Get Java version information
    1.6.0_13-b03
15. Exercise #3: Use "FreeTTS" Speech Synthesizer 3rd-party Java Library (p.7-14)
16. (3.1) JRuby_UseJavaSpeechLibrary (p.8-14) Changed properties to include the speech jar files. Ran the program and hear the two sentence and this: ----Allocate a voice
    ----Speak out
17. Exercise #4: Use "JFreeChart" 3rd-party Java Library (p.14-21)
18. (4.1) JRuby_UseFreeChartLibrary (p.14-21) Answer: Ran the program and saw the graph with this text: redefining File
    Rendering sparkline
19. Exercise #5: Use your own Java library (p.22-31)
    
20. (5.1) HelloJavaLibrary (p.22-31) Answer: init:
    deps-jar:
    Created dir: C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\HelloJavaLibrary2\build\classes
    Compiling 1 source file to C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\HelloJavaLibrary2\build\classes
    compile:
    Created dir: C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\HelloJavaLibrary2\dist
    Building jar: C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\HelloJavaLibrary2\dist\HelloJavaLibrary2.jar
    jar:
    BUILD SUCCESSFUL (total time: 0 seconds)
    
21. (5.2) Create, build, and run JRuby application (p.31-42): Ran program and got this: ----Create an object from Hello Java class
    ----Invoke a method of from Hello object
    HelloMessage from Hello Java Class!!
22. Exercise #6: Naming Conventions: (p.43-44)
23. (6.1) JRubyNaming_JavaClass (p.43) Answer: Got small window with "Hello World!" in it.
24. (6.2) JRubyName_JavaMethod (p.43-44) Answer: ----Create an object from Hello Java class
    ----Invoke a method of from Hello object
    HelloMessage from Hello Java Class!!
25. Homework Exercise: First create a Java Library (p22-31) : init:
    deps-clean:
    clean:
    init:
    deps-jar:
    Created dir: C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\ComputeJavaLibrary\build\classes
    Compiling 1 source file to C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\ComputeJavaLibrary\build\classes
    compile:
    Created dir: C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\ComputeJavaLibrary\dist
    Building jar: C:\cygwin\home\jasnow\RAILSPASSION\ruby_jruby\samples\ComputeJavaLibrary\dist\ComputeJavaLibrary.jar
    jar:
    BUILD SUCCESSFUL (total time: 0 seconds)
26. Then create JRuby application. IT WORKED. 7
    3
    0
    75