How to parse numbers more strict than what NumberFormat does in Java?

Question

I\'m validating user input from a form.

I parse the input with NumberFormat, but it is evil and allow almost anything. Is there any way to parse number more strict?

Answer 1

There are many ways to do that:

• regex - check if it matches("\\d+")
• with javax.validation - @Digits(fraction=0, integer=5)
• apache commons IntegerValidator