Java Dynamic Function Call

Question

I have a class

class JsonMap extends HashMap<String, Object> {}

I initialized an object like this

JsonMap jm = new JsonMap();

I am inserting data into it like this

jm.put("id", 4);
jm.put("message", "Hello");

but i want to do something easy like this with same effect.

jm.setId(4);
jm.setMessage("Hello");

Is this possibe without having to write methods setId and setMessage in JsonMap class?

function name is dynamic: first part is always 'set' and second part is dynamic value. this will go as key inside HashMap.

Can anyone show me how to achieve this, if it's possible?

i don't think that making something like dynamic methods or similar to javascript prototype is possible in java. — itwasntme
– itwasntme, Commented Aug 18, 2015 at 19:45
My question is why would you do that? jm.put("key","value") is already very simple in writing — itwasntme
– itwasntme, Commented Aug 18, 2015 at 19:56
U also can mess up a little bit and make something like this: pastebin.com/MtggQ9Ec but for me it just looks worse than standard jm.put("key","val"); — itwasntme
– itwasntme, Commented Aug 18, 2015 at 20:17

Gergely Bacso · Accepted Answer · 2015-08-18 20:08:11Z

1

What you are looking for is not possible as the language does not support this kind of feature, so at least you can stop looking for a built-in language feature. The alternative options you may want to look at:

professional JSON serializers (like Jackson)
JSONtoPOJO converters (many of these are available online)

answered Aug 18, 2015 at 20:08

Gergely Bacso

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Comments

Andreas · Accepted Answer · 2015-08-18 20:03:46Z

0

Java is a strongly typed language, not a scripting language, so no, it is not possible without having to write methods setId and setMessage in the JsonMap class.

answered Aug 18, 2015 at 20:03

Andreas

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Comments

nLee · Accepted Answer · 2015-08-19 02:14:48Z

0

you would need to write methods to do this for you

public void setId(int id) {
    jm.put("id", id);
}

public void setMessage(String message) {
    jm.put("message", message);
}

edited Aug 19, 2015 at 2:14

answered Aug 18, 2015 at 19:45

nLee

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3 Comments

itwasntme Over a year ago

whole implementation would be case dependent and he would need to write method for every key he wants to include to JSON object

Andreas Over a year ago

@syraz37 Java is a strongly typed language, not a scripting language. jm.setId(4) requires that the setId(int) method is defined in the class.

Andreas Over a year ago

@nLee Given his example, the setId method should take an int.

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