使用generic作为方法参数

Question

I have a problem when using generic types. IDE show me following error:

Cannot select from a type variable 

I think here problem with type erasure, but I think here exist some workaround...

My code:

class MyFactory {
  public Object getByClass(Class<?> clazz) {
     ..... 
  }
}


class<T> MyClass {
  private Object myObj = MyFactory.getByClass(T.class);  // HERE ERROR, `Cannot select from a type variable` 
  ...
}

How to solve this problem?

Answer 1

Pass the Class object into the constructor.

private final Class<T> clazz;
private Object myObj
public MyClass(Class<T> clazz, MyFactory myFactory) {
    this.clazz = clazz;
    this.myObj = myFactory.getByClass(clazz);
}