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How java checks that strings contain only numbers

2025-04-06 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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This article mainly shows you "java how to check string contains only numbers", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "java how to check string contains only numbers" this article.

How to check that a string contains only numbers

There is a silly solution, which is to use Long.parseLong (string) to forcibly convert a string. If the string is not transformed into a shape, it must not just contain numbers, right?

But this method is too undesirable, so another ingenious way is to use regular expressions.

Public class CheckIfStringContainsDigitsOnly {public static void main (String [] args) {digitsOnlyString ("123Silence King"); digitsOnlyString ("123");} private static void digitsOnlyString (String string) {if (string.matches ("\\ d + ")) {System.out.println (" string containing only numbers: "+ string);}

The output is as follows:

Contains only numbers: 123is all the content of the article "how to check that java contains only numbers in a string". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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