java - Check if string taken with Scanner.next() contains number -

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I wanted to take a string using the scanner .next () and see if there is a number in it or not. I used regex to check whether there is a number in the string but there is a number. The rajx works correctly if the string is coded hard, but not with the keyboard. I hope 5 will be detected as numbers, but it is not. Please tell me why. My code: 

  import java.util.Scanner; Public class error {public static zero main (string [] args) {scanner inp = new scanner (System.in); Int num = 0; String input = ""; Boolean isStringNumber = true; System.out.println ("\ nPlease enter only one number ..."); Input = inp.nextLine (); IsStringNumber = input.contains ("[^ 0- 9] +"); If (isStringNumber == incorrect) {System.out.println ("\ nYou have entered a non-number" + input); }}}}

A string as its argument > Uses. Instead, use mail 

  isStringNumber = input.matches ("[0-9] +");

Or simply 

  isStringNumber = input.matches ("\\ d +");

BTW: scanner has a nextInt method to accept the integer value


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