Calling a getter multiple times or calling once and assigning to a variable?

Question

say suppose I have class as :

public class Age {

    private int age;

    public int getAge() {
       return this.age;
    }

}

In my Main c

Answer 1

I'll try to say with code examples what the other answer already said.

In the case you presented the call for getAge() is very very simple, and the cost of calling it is almost nothing. Don't bother with it in this case.

But if your getAge was something fancy that do lots of calculations or access IO resources, like:

public int getAge() {
   return slowService.calculateAgeByBirthDate(birthDate); // it takes 2 seconds to execute for every call
}

Then for sure it would be a good idea to cache de result and use it. Because if you call it 30 times your code will take 1 minute to complete.