public static void notEmpty(String message, String string) {
        if (string == null || string.trim().isEmpty()) {
            throw new IllegalArgumentException(message);
        }
    }
public static void notEmpty ( String message , String string ) { if ( string == null || string . trim ( ) . isEmpty ( ) ) { throw new IllegalArgumentException ( message ) ; } }
Verifies that the given string is neither <code>null</code> nor empty and throws an
<code>IllegalArgumentException</code> with the given message otherwise.

@param message message that should be included in case of an error
@param string  string that should be checked