[netrexx-course] Re: Netrexx class question

[Thom Stone]

Well this gets me further down the path to success, but I'm still not there
with this program.  I ran the program as suggested and received an error.
The same error I'll post here.  So I moved my nrxbeans directory back under
the nrxredbk directory where it originated and I changed my classpath
statement from C:\NetRexx; to C:\NetRexx\NrxRedBk; and I rebooted and tried
again.  Now as before I receive this error.
C:\WINDOWS>cd\netrexx\nrxredbk

C:\NetRexx\NrxRedBk>java nrxbeans.lab.NrxLED
In class nrxbeans/lab/NrxLED: void main(String argv[]) is not defined


C:\NetRexx\NrxRedBk>

Does this need to run as an applet?  Do I need a Main function for a stand
alone application?

-----Original Message-----
From: [hidden email] <[hidden email]>
To: [hidden email] <[hidden email]>
Date: Tuesday, April 20, 1999 7:59 PM
Subject: [netrexx-course] Re: Netrexx class question


>
>
>You need to run this class using:
>
>     java nrxbeans.lab.NrxLED
>
>from the directory *above*  your nrxbeans directory.
>
>Note the package statement, which effectively adds the package name onto
the

>class name (qualifies it).
>
>--
>dIon Gillard, Multitask Consulting
>Work:      http://www.multitask.com.au
>Play:        http://www.trongus.com
>
>
>This is the sample from the NrxRedbk\nrxbeans\lab directory of the IBM
>Redbook samples.
>I have a directory called NetRexx and I copied the nrxbeans and
>subdirectories to it to give me a NetRexx\nrxbeans\lab structure.  I tried
>to set up my classpath to run from their directory, but I ran out of
>environment space.  Windows only gives you so much room.  Here is the code
>for NrxLED.
>
>/* nrxbeans\lab\NrxLED.nrx
>
>   A simple LED display bean, with numbers, colon, point, minus, blank */
>
>package nrxbeans.lab   -- if you change the package name you also need to
>modify
>                       -- the path to the LED GIF files
>
>import java.awt.
>import java.beans.
>
>class NrxLED binary extends Canvas implements Serializable
>
>  properties private static
>    DIGIT_WIDTH  = int 7
>    DIGIT_HEIGHT = int 16
>    MAX_DIGITS   = int 14
>    DIGIT_BLANK  = byte 10
>    DIGIT_COLON  = byte 11
>    DIGIT_DOT    = byte 12
>    DIGIT_MINUS  = byte 13
>
>  properties private
>    digits = Image[]
>
>  properties indirect
>    numberOfDigits = int
>    text           = String
>
>  method NrxLED() public
>    super()
>    ------------------------------ load the digit images
>    digits = Image[MAX_DIGITS]
>    loop i = 0 to MAX_DIGITS-1
>      imageName = "/nrxbeans/lab/LED" || i || ".gif"    -- must be in same
>path as class
>      digits[i] = loadImage(imageName)
>      if digits[i] = null then
>        System.err.println("Couldn't load image" imageName)
>    end
>    ------------------------------ set properties
>    setNumberOfDigits(8)
>    setText("88:88:88")
>    setBackground(Color.black)
>    setForeground(Color.green)
>
>  method loadImage(imageName = String) private returns Image
>    imgUrl = this.getClass().getResource(imageName)
>    return Toolkit.getDefaultToolkit().getImage(imgUrl)
>
>  method getPreferredSize() returns Dimension
>    return Dimension((2+DIGIT_WIDTH)*numberOfDigits+4, -
>                      DIGIT_HEIGHT + 6)
>
>  method paint(g = Graphics) protect
>    width = getSize().width
>    height = getSize().height
>    g.setColor(getBackground())
>    g.fillRect(1, 1, width-2, height-2)
>    g.setColor(Color.black)
>    g.draw3DRect(0, 0, width-1, height-1, 0)
>    paintDigits(g)
>
>  method paintDigits(g = Graphics)
>    loop i = 0 to text.length()-1
>      c = text.charAt(i)
>      select
>        when c >= char '0' & c <= char '9' then idx = byte c - '0'
>        when c = ':' then idx = DIGIT_COLON
>        when c = '.' then idx = DIGIT_DOT
>        when c = '-' then idx = DIGIT_MINUS
>        otherwise         idx = DIGIT_BLANK
>      end
>      g.drawImage(digits[idx], 3+i*(2+DIGIT_WIDTH), 3, this)
>    end
>
>  method setNumberOfDigits(n = int)
>    numberOfDigits = Math.max(0, Math.min(12, n))
>    sizeToFit()
>
>  method setText(aText = String)
>    if aText.length() <= numberOfDigits then text = aText
>    repaint()
>
>  method sizeToFit()
>    d = getPreferredSize()
>    setSize(d.width, d.height)
>    p = getParent()
>    if p \= null then do
>      p.invalidate()
>      p.doLayout()
>    end
>
>Thanks,
>Thom Stone
>[hidden email]
>
>
>-----Original Message-----
>From: [hidden email] <[hidden email]>
>To: [hidden email] <[hidden email]>
>Date: Monday, April 19, 1999 10:39 PM
>Subject: [netrexx-course] Re: Netrexx class question
>
>
>>
>>
>>Java classes are case sensitive. NetRexx usually isn't. Sounds like the
>NrxLED
>>should be called nrxLED or NRXLed or something similar....can you post

some

>>snippet of source code for the NrxLed class definition?
>>
>>--
>>dIon Gillard, Multitask Consulting
>>Work:      http://www.multitask.com.au
>>Play:        http://www.trongus.com
>>
>>
>>
>>
>>I seem to have the course installed ok and most examples seem to compile
>and
>>run ok, but I found this NrxLED that looked interesting to me and no

matter

>>what I do with it I get the same error when I try to run it.  I have no
>idea
>>what it means. Any help would appreciated.
>>Error loading class NrxLED : Wrong name
>>This comes after either :
>>NRC -RUN NrxLED
>>which compiles ok, or once I have the class file after
>>JAVA NrxLED
>>Here is my classpath statement:
>>SET
>>CLASSPATH=C:\jdk1.1.8\LIB\NetRexxC.zip;C:\NetRexx;C:\jdk1.1.8\bin;C:\jdk1.

1

>.
>>8\LIB\xclasses.jar;C:\Data\NetRexx
>>My directory structure is:
>>C:\NetRexx\NrxLED.nrx
>>C:\NetRexx\NrxLED.java
>>C:\NetRexx\NrxLED.class
>>C:\NetRexx\nrxbeans\lab\........the package files
>>So far this OO stuff leaves me feeling like I'm missing a really important
>>point somewhere.
>>Thanks,
>>Thom
>>
>
>
>
>
>
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