/**

* Example of argument validation.

*/

public class ArgValid {

public static boolean isCapitalized(String str) {

if (str == null || str.isEmpty()) {

return false;

}

return Character.isUpperCase(str.charAt(0));

}

public static void main(String[] args) {

System.out.println(isCapitalized("Hi!"));

System.out.println(isCapitalized("bye"));

System.out.println(isCapitalized(""));

System.out.println(isCapitalized(null));

}

}