Hi People, I have an issue in Core java. Consider the Employee class having an attribute called age.

class Employee{           
      private int age;     
      public void setAge(int age);     
}

My question is how do i restrict/prevent setAge(int age) method such that it accepts only positive numbers and it should not allow negative numbers,

Note: This has to be done without using client side validation.how do i achieve it using Java/server side Validation only.The validation for age attribute should be handled such that no exception is thrown