Java中利用Optional处理字符串转数字问题

public class StringUtil {
    public static Optional<Double> toDouble(String s){
        try{
            return Optional.of(Double.parseDouble(s));
        }catch (Exception e){
            return Optional.empty();
        }
    }
}

Student student = new Student();
StringUtil.toDouble(gradeField.getText()).ifPresent(grade->student.setGrade(grade));