How to check whether given String contains only digits in Java?



Problem Description :


Write a program in Java that checks whether given String contains only digits or not?

Java program that checks whether given string contains only digits or not.
Given String contains only digits or not?

Concept :


We can solve this problem with and without regular expressions. Both the methods are very simple and straightforward.


Java Program :


1) Without Regular Expressions :




2) With Regular Expressions :




Output :


Case 1 :


Output of Java program that checks whether given string contains only digits or not - case1
Output - String contains only digits.


Case 2 :


Output of Java program that checks whether given string contains only digits or not - case2
Output - String not contains only digits.

References :




http://docs.oracle.com/javase/7/docs/api/java/lang/Character.html

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Tags : Digits validation in String, Solution in Java, String, Regular expressions, for loop, while loop, if else statement, Character.

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How to check whether given String contains only digits in Java? How to check whether given String contains only digits in Java? Reviewed by Unknown on 12/30/2016 Rating: 5

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