Generic class that accepts either of two types

Question

I want to make a generic class of this form:

class MyGenericClass {}

Problem is, I want to be acceptable for T to b

Answer 1

You asked for a class that accepts either of two types. That has already been answered above. However I will also answer how you can extend that idea to a method within the class you are using without need for creating another class for this. You want to use just : -

• Integer
• Long

• Not Double

  private  T doSomething(T value) throws IllegalArgumentException{
  
         if(value instanceof Integer){
              return (Integer)value;
          }
        else if(value instanceof Long){
              return new value.longValue();
          }
        else
             throw new IllegalArgumentException("I will not handle you lot");
  }