Hi,

I've got a question related to java performance and method execution.

In my app there are a lot of place where I have to validate some parameter, so I've written a Validator class and put all the validation methods into it. Here is an example:

public class NumberValidator {
    public static short shortValidator(String s) throws ValidationException{
        try{
            short sh = Short.parseShort(s);

            if(sh < 1){
                throw new ValidationException();
            }
            return sh;
        }catch (Exception e) {
            throw new ValidationException("The parameter is wrong!");
        }
    }
...

But I'm thinking about that. Is this OK? It's OO and modularized, but - considering performance - is it a good idea? What if I had awful lot of invocation at the same time? The snippet above is short and fast, but there are some methods that take more time.

What happens when there are a lot of calling to a static method or an instance method in the same class and the method is not synchronized? All the calling methods have to fall in line and the JVM executes them sequentially?

Is it a good idea to have some class that are identical to the above-mentioned and randomly call their identical methods? I think it is not, because "Don't repeat yourself " and "Duplication is Evil" etc. But what about performance?

Thanks is advance.