Using Longs as Keys in Groovy Map

Question

I want a Map to contain numeric mappings, I do:

Long long1 = 44l;
Long long2 = 45l;

def myMap = [long1: 26, long2: 27];

println(myMap)

But what is outputted is:

[long1:26, long2:27]

I want it to be:

[44: 26, 45: 27]

And I need to do this through variables, as I don't know what the values will be until runtime?

Thanks.

Groovy does that for all variables (not only Long). If we want to use the value as key then syntax mentioned in answer has to be used. — dmahapatro, Feb 11 '14 at 19:00

score 7 · Accepted Answer · edited May 23 '17 at 10:25

7

Change your map declaration to the following:

def myMap = [(long1): 26, (long2): 27]

Groovy is doing some implicit variable-name-to-String conversion when you declare your Map, so instead of it evaluating long1 it is using long1 as a String key name. Also see this StackOverflow question.

edited May 23 '17 at 10:25

Community

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answered Feb 11 '14 at 17:04

grantmcconnaughey

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Using Longs as Keys in Groovy Map

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