Instantiate a class - java

Question

I have an enum class with the params id and Class.

ENUM1(1, class.class);

private int id;
private Class<?> clazz;

ENUM(int id, Class<?> clazz) {
    this.id = id;
    this.clazz = clazz;

}

The class implements an abstract interface.
But how can i access the public methods of the "class.class"?

Thanks in advance!

Just asked the same question :) http://stackoverflow.com/questions/31983540/creating-an-instance-for-class/31983719#31983719 — Suresh Atta, Aug 13 '15 at 10:02
It would help if you'd provide a short but complete program that demonstrates the problem. As far as I'm aware, `class.class` isn't valid syntax, for example. What *exactly* are you trying to do, and what does this have to do with enums? — Jon Skeet, Aug 13 '15 at 10:03

Karthik R · Accepted Answer · 2015-08-14T03:43:05.833

1

You can do this following from the Class using reflection API.

Object obj = object.getClass().newInstance();//instantiates using default constructor provided that there are no checked exceptions thrown. Consider `Constructor` instead
object.getClass().getDeclaredMethod("ImPublicMethodName", param1, param2).invoke(object);

edited Aug 14 '15 at 03:43

answered Aug 13 '15 at 10:05

Karthik R

5,523
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score 1 · Answer 2 · edited May 23 '17 at 11:43

1

Considering Why is Class.newInstance() "evil"? I'd use something like:

    Constructor<?> ctor = clazz.getDeclaredConstructor();
    Object obj = ctor.newInstance();
    Method method = clazz.getDeclaredMethod("yourMethod");
    method.invoke(obj);

The getDeclaredXZY methods optionally take the types of arguments as well.

edited May 23 '17 at 11:43

Community

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answered Aug 13 '15 at 10:20

Dennis Hunziker

1,293
10
19

Instantiate a class - java

2 Answers2