Key as Integer and Value as IntegerArray

Question

I have the following HashMap:-

HashMap<Integer,Integer[]> possibleSeq = new HashMap<Integer,Integer[] >();

I would like to add into the map something like this:-

 possibleSeq.put(1,{1,2,3,4});

There are a large number of entries and i am supposed to enter manually:- I tried doing this:-

Integer a = 1;
Integer aArr = {1,2,3,4};
  possibleSeq.put(a,aArr);

But this is not my requirement.I dont want to create separate Integer variables to store keys and separate Integer Arrays to store my values ie IntegerArray .Any Ideas??

int[] is an array, which is an object, so it's OK. Just tried it, works fine. — ajb
– ajb, Commented Jul 30, 2013 at 15:00

arshajii · Accepted Answer · 2013-07-30 14:39:43Z

7

How about this:

public static void put(Map<Integer, Integer[]> map, Integer k, Integer... v) {
    map.put(k, v);
}

...

put(map, 1, 1,2,3,4);

answered Jul 30, 2013 at 14:39

arshajii

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3 Comments

Boris the Spider Over a year ago

+1, I like this, quite neat. You could even extend Map to create a more "native" looking api.

Tom Hawtin - tackline Over a year ago

And you can go further with a builder that has map as a field and can return this for chaining.

Marko Topolnik Over a year ago

And while on the subject of builders, by all means provide a factory method with a short name, which you can import static. That brings conciseness to the peak, without hurting readability a bit.

Boris the Spider · Accepted Answer · 2013-07-30 14:38:26Z

1

You can new the Integer[] inline:

possibleSeq.put(1, new Integer[]{1,2,3,4});

answered Jul 30, 2013 at 14:38

Boris the Spider

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1 Comment

John Snow Over a year ago

Oh Yes!! ...My bad!! ...+1 for the answer:)

Jesper · Accepted Answer · 2013-07-30 14:38:54Z

0

possibleSeq.put(1,{1,2,3,4});

This is not valid Java syntax. Try this instead:

possibleSeq.put(1, new Integer[]{1,2,3,4});

answered Jul 30, 2013 at 14:38

Jesper

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Comments

PermGenError · Accepted Answer · 2013-07-30 14:38:55Z

0

{1,2,3,4,5,6} is not an array new Integer[]{1,2,3,4,5} is an array of integers.

 possibleSeq.put(1,new Integer[]{1,2,3,4});

answered Jul 30, 2013 at 14:38

PermGenError

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