Question

How to check if a string contains only alphabets letters in Java

Answer 1

public class MyClass {
    public static boolean isAlphabet(String s) { 
        return ((!s.equals("")) 
                 && (s != null) 
                 && (s.chars().allMatch(Character::isLetter))); 
    } 

    public static void main(String args[]) {
        String s = "JavaProgramming";

        if (isAlphabet(s))
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}


/*
run:

Yes

*/

 

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Answer 2

public class MyClass {
    public static boolean isAlphabet(String s) { 
        if (s == null || s.equals("")) { 
            return false; 
        } 
        for (int i = 0; i < s.length(); i++) { 
            char ch = s.charAt(i); 
            if ((!(ch >= 'A' && ch <= 'Z')) && (!(ch >= 'a' && ch <= 'z'))) { 
                return false; 
            } 
        } 
        return true; 
    } 
 
    public static void main(String args[]) {
        String s = "JavaProgramming";
 
        if (isAlphabet(s))
            System.out.println("Yes");
        else
            System.out.println("No");
    }
}
 
 
/*
run:
 
Yes
 
*/

 

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