How to check if a string has only letters

Question

The point is to have a String read and to verify if it contains only letters. For example "qwerty123" would not be acceptable.

Answer 1

The following is the code for your answer:

public static void main(String[] args)

{

Scanner reader = new Scanner(System.in);  

System.out.println("Enter a string: ");

String name = reader.nextLine();

reader.close();

char[] chars = name.toCharArray();

int i=0;

    for (char c : chars)

        if(!Character.isLetter(c))

          i++;

    if (i>0)

    System.out.println("The string does not contain only letters");

    else

    System.out.println("The string contains only letters");

}

Answer 2

You could probably use Java 8 lambda expressions, they are fast and simple.

boolean allLetters = someString.chars().allMatch(Character::isLetter);