JRuby Great Addition To Java Development

An anonymous reader writes "JRuby combines the object-oriented strength of Smalltalk, the expressiveness of Perl, and the flexibility of the Java class libraries into a single, efficient rapid development framework for the Java platform. This article introduces JRuby, a sophisticated addition to your Java development toolbox."

Comments

So... work with me here....

[FooAtWFU]

So... it compiles Ruby-type code... into Java bytecode? and then links the bytecode against Sun's libraries? Nifty!

Time to cue the Java-is-slow/big/bloated crowd and s/Java/JRuby/, though.

Re:So... work with me here....

[Anonymous Coward]

Hey sonny, some of us Java programmers need jobs. If word gets out about Rails, I'll be sent out into the street.

AND WE CAN'T HAVE THAT SONNY! So just you keep that Rails business under your hat.

Why, I hear in Rails if you want to add a page to your web site, you just, uhm, create the file. What kind of madness is that! You gotta save the file, then edit an XML file to give the file a name string, then edit another XML file to associate a bean to the name string, then write a bean with getter and setter methods for each field in the file, then associa... hey wait a minute these are trade secrets.. you gotta do some work, that's what I'm saying.

And this Ruby language, I doubt it can make adding two numbers any easier than this:

mathOperation adder = operationFactory(BinOp.ADDITION);
expressionNumbe r addend = new Number(2);
expressionNumber augend = addend.clone(); //shortcut

// TODO: set this up with an XML file
mathExpression exp = new Expression();
try {
exp.setOp(adder);
exp.setLHS(addend, mathExp.ASSUME_INTEGER);
exp.setRHS(augend, mathExp.ASSUME_INTEGER);
} catch mathExp.pointlessError { }

expressionResult result = exp.compute(mathExp.IMMEDIATE);

int intResult = result.getInt();

System.out.println("2 + 2 =" + intResult);

Don't you just love the POWER OF JAVA!!! I feel like I can achieve anything in Java, given enough time.

JRuby versus Java [code comparison - short]

[tod_miller]

JRuby

require 'java'
module Swing
include_package 'java.awt'
include_package 'javax.swing'
end
module AwtEvent
include_package 'java.awt.event'
end

$calculator = Swing::JFrame.new
class << $calculator

def init
end

end

$calculator.init
$calculator.setSiz e(400, 400)
$calculator.setVisible(true)

versus Java

import javax.swing.JFrame;
public class Calculator extends JFrame {
public Calculator(){
super("Slashdot Rul3z");
setSize(400, 400);
setVisible(true);
}
public static void main(String[] args) {new Calculator();}
}

and we have a winner

Re:JRuby versus Java [code comparison - short]

[bzhou]

vs. Jython

from java import awt
from pawt import swing

labels = ["0", "1", "2", "+",
"3", "4", "5", "-",
"6", "7", "8", "*",
"9", ".", "=", "/" ]

keys = swing.JPanel(awt.GridLayout(4, 4))
display = swing.JTextField()

def push(event):
display.replaceSelection(event.actionCommand)

d ef enter(event): # <= def, slashdot formatting bug?
display.text = str(eval(display.text))
display.selectAll()

for label in labels:
key = swing.JButton(label)
if "=" == label:
key.actionPerformed = enter
else:
key.actionPerformed = push
keys.add(key)

panel = swing.JPanel(awt.BorderLayout())
panel.add("North ", display)
panel.add("Center", keys)
swing.test(panel)

About that name

[HughsOnFirst]

So when I tell somone that this is the right tool for the job , how am I supposed to pronounce it?
ja-ru-bee? ( gummie candy treat perhaps? )
har-you-bee ?
or jay-ru-bee as though it were named after Lee Harvey Oswald's killer Jack Ruby ( J. Ruby ) ?