Convert Map<String, String[]> to Map<String, Object[]> in java

Question

Is there any method to convert the map obtained from servletRequest.getParameterMap() which returns a Map<String, String[]> to Map<String, Object[]> in a simple way other than a for loop?

I have a method getSomething() which is declared as

public Response getSomething(final Map<String, Object[])

I have to call this method with servletRequest.getParameterMap() as input.

Your question looks like XY problem. Can you add more info about why you need this change? — Pshemo
– Pshemo, Commented Jul 16, 2015 at 19:42
Also what do you mean by convert? Can we assume that you want to get new independent map which will be copy of original one (since otherwise you could try adding Integers to array of Objects which really will be still array for Strings). — Pshemo
– Pshemo, Commented Jul 16, 2015 at 19:56
Just in case you don't know it: to add more informations to your question use edit option. — Pshemo
– Pshemo, Commented Jul 16, 2015 at 19:59

Louis Wasserman · Accepted Answer · 2015-07-16 20:03:03Z

7

Sure.

Map<String, Object[]> objectMap = 
    Collections.unmodifiableMap(servletRequest.getParameterMap());

This is correct, type-safe, and doesn't risk problems with accidentally putting wrongly typed values into the map.

edited Jul 16, 2015 at 20:03

answered Jul 16, 2015 at 19:42

Louis Wasserman

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Pshemo Over a year ago

I also doesn't prevent us from trying to place non-string value to String[] array via Object[] reference (although this behaviour will be stopped at runtime).

Community · Accepted Answer · 2017-05-23 12:29:48Z

0

This way uses Java raw types.

Map<String, String[]> map1 = new HashMap<>();
Map<String, Object[]> map2 = (Map)map1;

This is a working solution although, as Pshemo pointed out, java raw types shouldn't be used.

edited May 23, 2017 at 12:29

CommunityBot

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answered Jul 16, 2015 at 19:52

Kamil Jarosz

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1 Comment

Pshemo Over a year ago

Mandatory link: What is a raw type and why shouldn't we use it?

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