Question

I done a method that receive a class and a int. I want to know if is possible and how I do to create an object from the passed Class parameters.

public void createObject(Class clazz, int n){
    for(int i=0;i<n;i++){
        //new object from the clazz
    }
}

It’s possible to do this? I will create te objects to run in threads.

How can I assure that the Class implements Callable?

EDIT: it’s possible calling a Construcor with arguments?

Answer 1

Do you means like this?

if(Callable.class.isAssignableFrom(clazz)) {
    Callable obj = (Callable) clazz.newInstance();

} else if (MyAbstractClass.class.isAssignableFrom(clazz)) {
    MyAbstractClass obj = (MyAbstractClass) clazz.newInstance();

} else {
    throw new IllegalArgumentException(clazz+" not valid");
}

If you have a constructor which takes arguments you can do

Callable obj = (Callable) clazz.getConstructor(int.class).newInstance(10);