Numerical filter

Question

How could i know if a given Object is Numerical(Integer,Double..) ???

Answer 1

Object obj1 = 123;
Object obj2 = "abc";

System.out.println(
obj1 instanceof Number
); // true

System.out.println(
obj2 instanceof Number
); //false

Answer 2

Martin Taylor My question is if i send an Object to a function as a parameter
How could i know the type of object