Groovy initialization of array of objects

Question

I am looking for the most compact syntax to initialize an array of objects in Groovy. Given:

class Program {
    String id = ""
    String title = ""
    String genre = ""   
}

I am currently doing this:

Program[] programs = [
    new Program([id:"prog1", title:"CSI", genre:"Drama"]),
    new Program([id:"prog2", title:"NCIS", genre:"Drama"]),
    new Program([id:"prog3", title:"Criminal Minds", genre:"Crime drama"]), 
] as Program[]

I seem to recall that in Java there is a more compact syntax, possibly not requiring to use the new keyword. What is the most compact Groovy syntax to accomplish this?

could you show example of this more compact syntax from Java? — Igor Artamonov
– Igor Artamonov, Commented Feb 25, 2014 at 3:25
Ok, memory failed me. It's been a while since I last wrote Java code. The shortened version is indeed only for basic types, not for objects. The shortest I could write in Java does not need to mention the name of the parameters in the call to the constructor, however it still needs the new keyword. I have edited my original post accordingly. — Captain Franz
– Captain Franz, Commented Feb 25, 2014 at 15:47

dmahapatro · Accepted Answer · 2014-02-25 13:22:31Z

31

@groovy.transform.Canonical
class Program {
    String id = ""
    String title = ""
    String genre = ""   
}

Program[] programs = [
    ["prog1", "CSI", "Drama"],
    ["prog2", "NCIS", "Drama"],
    ["prog3", "Criminal Minds", "Crime drama"]
]

println programs

Please also answer @Igor's question.

edited Feb 25, 2014 at 13:22

answered Feb 25, 2014 at 5:13

dmahapatro

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3 Comments

tim_yates Over a year ago

Or you can change def programs to Program[] programs and get rid of the as Program[] at the end :-)

dmahapatro Over a year ago

Yup, makes more sense and less code. Changing right away. Thanks.

Captain Franz Over a year ago

Thank you. This worked great. I also answered Igor's question and edited my original post accordingly.

Per Eriksson · Accepted Answer · 2025-03-05 10:32:36Z

0

The classic Java way works in groovy

int[] hi = new int[] { 3, 4, 5 }

answered Mar 5 at 10:32

Per Eriksson

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