How to check if a String has only alphabets

You can use Java regular expressions to check if a String has only alphabets as follows:

package demo;

public class StringDemo {

public static void main(String[] args) {
String str = "HelloWorld";
String regex = "^[a-zA-Z]+$";
boolean matches = str.matches(regex);
System.out.println(matches);

}
}

The above code will print true when you run it. If you change the String str to have any other characters like numbers or special characters, it will print false.