Java objects with data members created dymaically

Question

I have seen in Javascript ,

var obj = {
}
function addMember(memberName,value) {
    obj[memberName] = value;
}

ie. objects can have members whose name is not known before at object/class declaration.So is there a similar way in Java ,where i can add new members to an object with unknown name?

http://stackoverflow.com/questions/11828160/adding-a-field-to-java-class Generally it means "no". — xeye, Dec 03 '12 at 19:16

score 5 · Accepted Answer · answered Dec 03 '12 at 19:14

5

You can do this with a Map.

Map<String, Object> map = new HashMap<>();

map.put(memberName, value);

answered Dec 03 '12 at 19:14

Peter Lawrey

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You're not adding members to an object, as was asked how to do – MStodd Dec 03 '12 at 19:19
objects don't have names. fields and local variable can have names like `obj` (in the example) or `map` – Peter Lawrey Dec 03 '12 at 19:19
@MStodd can you say how the implementation of adding members in JS differs from an associative array or map? – Peter Lawrey Dec 03 '12 at 19:20
1

@PeterLawrey it doesn't. In JS, you can add a member with obj[name] = value, then access it with obj.name. You can't do this in Java. The question was "...is there a similar way in Java ,where i can add new members to an object..." – MStodd Dec 03 '12 at 19:24
So by this way it is possible to add members with unknown names? – Jinu Joseph Daniel Dec 03 '12 at 19:50
@JinuJD When the names are unknown, what do you want it to do? – Peter Lawrey Dec 03 '12 at 20:27

Java objects with data members created dymaically

1 Answers1