Java Program to Check if a String is Numeric

Example

You can check if a given string is Numeric as shown in the following program.

Live Demo

import java.util.Scanner;
public class StringNumeric {
   public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter a string ::");
      String str = sc.next();
      boolean number = str.matches("-?\d+(\.\d+)?");

      if(number) {
         System.out.println("Given string is a number");
      } else {
         System.out.println("Given string is not a number");
      }
   }
}

Output

Enter a string ::
4245
Given string is a number

Chandu yadav

Updated on 13-Mar-2020 13:01:54

• Related Questions & Answers
• Java program to check if string is pangram
• Java Program to check if a string is a valid number
• Java Program to check if a string is empty or not
• Java Program to Check if a String is Empty or Null
• Java Program to Check if a string contains a substring
• Java program to check if a Substring is present in a given String
• How to check if input is numeric in C++?
• C Program to Check if a Given String is a Palindrome?
• How to check if a unicode string contains only numeric characters in Python?
• Python program to check if the string is pangram
• Java program to check if a string contains any special character
• C# program to check if a string is palindrome or not
• Python program to check if a string is palindrome or not
• Python program to check if a given string is number Palindrome
• How to check if String is empty in Java?