JAVA functions in NetRexx

[Robert L Hamilton]

I finally found the example in TNRL where NetRexx meets Java. NetRexx can parse built in functions from Java, e.g. Date().

Is there a list of Java 'things' that can be used in NetRexx?

bobh

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[Patric Bechtel]

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Robert Hamilton schrieb am 15.04.2010 12:09:
> I finally found the example in TNRL where NetRexx meets Java. NetRexx
> can parse built in functions from Java, e.g. Date().
>
> Is there a list of Java 'things' that can be used in NetRexx?

Short answer: all. There's almost nothing in Java which cannot be used
in NetRexx, just in a nicer, more concise syntax. The only things
missing is generics (though the classes can be used, just the type info
is gone, so you have to cast, though), annotations and anonymous inner
classes (who doesn't hate these, anyway?).

- --
Patric
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[David Requena]

Robert,

The answer would be: the full java library. Some syntax constructs are not available as Patrick pointed out though.

Mind there's an implied misconception in your question: Java (hence NetRexx) has no such concept as 'built-in functions', or any kind of functions for that matter...

Being a fully object oriented language you only get methods; be it instance methods or class methods (static methods in java parlance).
A special kind of method is one with the same name as a class. This is called a constructor and instantiates an object of that class.

So in your example Date() would just construct an object. This, not being assigned to anything, would just be eventually garbage collected.

A little working example could be:

dt1 = Date()        -- a java.util.Date object with 'now' value is built and assigned to dt1
dt2 = Date()        -- same with a latter 'now'. Assigned to dt2
dt3 = java.text.DateFormat.getInstance().parse("07/10/96 4:5 PM, PDT") -- see note bellow

-- now you can call any of java.util.Date's intance methods on dt1, dt2 and dt3 as in:

say dt1.toString()  -- prints 'Thu Apr 15 13:03:06 CEST 2010'
say dt2.toString()  -- prints 'Thu Apr 15 13:03:17 CEST 2010'
say dt3.toString()  -- prints 'Mon Oct 07 04:05:00 CEST 1996'
say dt1.after(dt2)  -- prints '0' (false)
say dt2.after(dt1)  -- prints '1' (true)
say dt3.before(dt1) & dt3.before(dt2) -- prints '1'


note: most of Date's methods are deprecated since java 1.1. Java documentation states:

"As of JDK 1.1, the Calendar class should be used to convert between dates and time
fields and the DateFormat class should be used to format and parse date strings.
The corresponding methods in Date are deprecated."

That is why dt3 is instantiated like it is here. Admittedly it is a bit long winded but the fact is that date handling/manipulation is a complex domain in itself. There is just an awful lot of calendars, time zones, locale conventions, etc. in effect.

El 15/04/2010 12:09, Robert Hamilton escribió:

I finally found the example in TNRL where NetRexx meets Java. NetRexx can parse built in functions from Java, e.g. Date().

Is there a list of Java 'things' that can be used in NetRexx?

bobh

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[rkumar]

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