CODEWITHSUNDEEP
javaobject
nikolay
nikolay

Reputation: 112

How can i get class from Object parameter?

If i put object of A class as argument of someMeth(Object o), how can i access to this object methods? I cant change or overrdie someMeth(Object o). 

...
void someMeth(Object o) {
     o.setS("example"); -- exception : setS() is undefined for type Object
}
...
class A {
    private String s;
    String getS () {
        return s;
    }
    void setS(String value) {
        s = value;
    }

}
...
someMeth(new A());

Upvotes: 2

Views: 490

Answers (2)

Vladimir Parfenov
Vladimir Parfenov

Reputation: 665

Try to convert type of reference:

void someMeth(Object o) {
     if (o instanceof A) {
         ((A) o).setS("example");
     }
}

Upvotes: 2

Kröw
Kröw

Reputation: 307

Try casting the object o to they type A like so:

A newObj = (A) o;

Then you can do:

newObj.setS("example");

Or a shorter, one line version:

((A)o).setS("example");

Upvotes: 2

Related Questions